Warming up
Less boo. More booked. Halloween offer: 30 days free on any paid plan. Claim 30 days free
Less boo. More booked. Halloween offer: 30 days free on any paid plan. Claim 30 days free
Blog
Practical, vendor-neutral writing on email deliverability, warmup, sender reputation, and cold outreach. No hot takes, no SEO filler, just the playbooks we actually use.
Latest · AI
You can ask Claude or ChatGPT to find leads, write a sequence, check your DNS and draft replies inside Warmerly. It cannot start a campaign for you. Here is the whole workflow.
5 min read
Warmup
Most of the time the mail still sends. It just lands in spam, and the damage attaches to your domain rather than one mailbox. Here is what to expect and when skipping is defensible.
5 min read
Comparison
Several free DMARC report tools exist in 2026, and they differ in domains, history and whether you get a dashboard or just an email. Here is each one, checked on the vendor's own page.
6 min read
Deliverability
No free tool can tell you exactly where every cold email lands. Together, a few free checks get you close: a spam score, your DNS records, blocklists, and a send to your own test inboxes.
6 min read
Comparison
Every cold email tool in this comparison pulls replies from all your sending mailboxes into one list. They differ on reply labels, teammate assignment and whether the inbox is built for one person or a team.
6 min read
Comparison
Most cold email tools can now write a line or a whole email with AI. They differ on what the AI reads about each lead, whether you can test it first, and what happens when it fails.
7 min read
Comparison
For an agency with many clients, the question is not features but structure: how each client is kept apart, what a client can see, and what each extra client adds to the bill. Here is how six tools answer it.
7 min read
Comparison
If you use Apollo mostly to send, you can pay less by moving the sending to a tool built for it. If you use it for its contact data, none of these replace that.
7 min read
DNS
An SPF record that needs more than 10 DNS lookups returns a permerror, and receivers treat it as if you had no SPF at all. Here is how to count the lookups, cut them and stop it coming back.
6 min read
DNS
When a DKIM check says the record is not found, the record is almost always there under a different name, or is mangled. These are the seven causes we see most, in the order to check them.
6 min read
DNS
The selector is the s= value in the DKIM-Signature header of any email your domain has sent. Here is how to read it in Gmail and Outlook, and what to do when you cannot send a test.
5 min read
Authentication
Every major mailbox provider writes its SPF, DKIM and DMARC verdicts into the message headers. Here is where to find them in Gmail and Outlook, and how to read the result.
6 min read
DNS
A 1024-bit DKIM key still works, but the major providers recommend 2048. Rotate by adding a second selector, switching signing to it, and only then removing the old one.
5 min read
Deliverability
Authentication proves your mail really comes from your domain. It says nothing about whether recipients want it. Here is what to check when everything passes and the mail still lands in spam.
7 min read
Deliverability
Spamhaus runs several lists and each one means something different. Find which one you are on first, because the fix, and whether you can ask for removal yourself, depends on it.
7 min read
Deliverability
A bounce message starts with a code. The first digit tells you whether to retry or stop, and the rest tells you whether the address, the mailbox or your sending reputation is the problem.
6 min read
DNS
A domain gets one SPF record. When you add a cold email or marketing tool, you add its include to that one record, then count the lookups. Here are the patterns, with examples.
5 min read
Deliverability
A placement test tells you where mail lands today. Warmup changes where it will land. Confusing the two is why people buy a tester when they needed warmup, or the other way round.
6 min read
Setup
Most cold email problems are set up before the first send. This checklist covers domains, authentication, mailboxes, warmup, the list and the first week, then what changes for a solo founder, an SDR team or an agency.
7 min read
Setup
Divide your daily target by what one warmed mailbox can safely send, then spread the mailboxes over domains at two to three each. Here is the sum, with examples.
5 min read
DNS
p=none watches, p=quarantine sends failures to spam, p=reject blocks them. Start at none, read the reports for a few weeks, and only tighten once every legitimate sender passes.
6 min read
DNS
SPF and DKIM can pass while DMARC fails, because DMARC checks that the passing domain matches your From address. Relaxed alignment allows a subdomain match. Strict does not.
5 min read
DNS
A sending domain still has to receive mail: replies, bounce notices and warmup messages all come back to it. Without MX records those fail, and a domain that cannot receive mail looks careless.
4 min read
DNS
BIMI lets a receiving inbox show your brand logo beside your messages. It needs DMARC at enforcement and, at the largest inboxes, a certificate. It is not a deliverability fix.
5 min read
Comparison
The cheapest LinkedIn automation tools in 2026 start at $6.99 a month, but the cheap ones are browser extensions that do not warm up an account. Here is what ten tools cost per seat or account, which ones ramp up activity gradually, and how.
8 min read
Cold email
Most cold email tools now include warmup, but not on the same terms. Some warm every mailbox for free, some give you two or three warmup slots and charge for the rest. Here is what eight of them include in October 2026, read from each vendor's own pricing page.
8 min read
Cold email
lemlist starts at $69 a month and includes lemwarm. Several cold email tools with built-in warmup start lower, but most of them also cap your monthly emails far below lemlist's 50,000. Here is the honest price comparison for October 2026.
7 min read
Warmup
Instantly and Smartlead both warm your mailboxes for you. You can still use an external warmup tool with the mailboxes they send from, as long as only one warmup runs on each mailbox. Here is what their official documentation says, and how to set it up safely.
7 min read
Deliverability
Gmail, Yahoo and Microsoft Outlook all publish sender requirements now, and all three enforce them. Here is every rule in one place, the bulk sender thresholds, the official source for each, and what it means if you send cold email.
8 min read
Warmup
Warmerly is an email warmup and cold outreach tool with a free plan. Here is what it does, what each plan costs, who is behind it, and the things you can check yourself before trusting it with a mailbox.
5 min read
Comparison
Only a few cold email tools have a free plan that never ends and needs no card. Most offer a 7 to 14 day trial instead. Here is what each free plan actually lets you send, checked on the vendors' own pages.
6 min read
Comparison
Most big cold email tools now run their own MCP server, so Claude or ChatGPT can work in your account. They differ in how you sign in, which AI apps they support, and whether the free plan can use them.
5 min read
Comparison
Most tools that do email and LinkedIn put both on their most expensive plan. Here is what one sender with one LinkedIn account pays on each, checked on the vendors' own pricing pages.
5 min read
Cold email
A cold email is a one-to-one business message to someone you have no prior relationship with. Here is what makes it legal and different from spam, how to write one, worked examples, and the setup to do first.
16 min read
Cold email
A cold email mailbox provider sells you the domains and inboxes you send from, with DNS set up for you. Here is what six of them cost per mailbox in October 2026, what each includes, and which one fits which sender.
7 min read
Transactional email
An SMTP relay is a mail server that takes the email your app or device hands it and delivers it to the recipient on your behalf. Here is how that works, what to set up so the mail is trusted, and when to skip SMTP and use an API instead.
7 min read
Comparison
Seven of the nine best-known outreach tools list email and LinkedIn in one subscription; Smartlead and Instantly list no LinkedIn on their pricing pages. Here is what one sender with one LinkedIn account costs on each, read from the vendors' own pages.
8 min read
Comparison
Both identify the companies visiting your website, but they sell it differently: Warmly publishes starting prices from $10,000 a year, Lead Forensics prices on your traffic after a one-week trial. Here is what each pricing page says.
6 min read
Deliverability
Your emails are going to junk for one of six reasons, and usually more than one at once. Here is how to diagnose which, fix it in the right order, and stop it happening again.
10 min read
Comparison
Instantly is built for high-volume cold email at a low entry price; Reply.io is a multichannel sales engagement platform priced per user. Here is the honest split, with real prices, three cost scenarios and the warmup question both leave to you.
10 min read
Comparison
The honest answer to Instantly vs Clay: they do different jobs. Clay builds and enriches your list; Instantly sends the cold email. Here is which to buy first if you can only afford one.
10 min read
Comparison
Both automate LinkedIn from the cloud and price per seat. Dripify puts LinkedIn and email sequences on every paid plan; Meet Alfred keeps email and X for its Business plan and above. Here is the split, with prices read from both pages.
7 min read
Comparison
Lemlist is email-first multichannel; Waalaxy is LinkedIn-first, with email only on its top plan. Here is what each pricing page says about plans, channels, trials and warmup, and the deliverability gap neither page covers.
7 min read
Comparison
Expandi sells one Business plan at $99 a month plus a custom Agency tier and lists automatic profile warm-up; Meet Alfred has four tiers from $35 a seat billed annually and adds email and X from its Business plan. Here is the split, from both pricing pages.
6 min read
Comparison
Instantly is built for cold email at volume with unlimited inboxes and warmup; lemlist is built for personalized sequences, and adds LinkedIn on its Multichannel plan. Here is the honest split, with real prices and the team sizes where each one wins.
9 min read
Cold email
Most reply volume comes from follow-ups, not first touches, but only if the spacing, channel mix, and stop conditions are right. Here's the cadence, with the numbers.
8 min read
Cold email
Instantly's Growth plan is $47 a month with unlimited accounts and a 5,000-email cap. Here are seven alternatives, what each charges on its own pricing page, and who each one suits.
10 min read
LinkedIn outreach
LinkedIn watches new accounts closely. Here is a week-by-week plan to warm one up (profile completeness, activity signals, and connection pacing) so it survives outreach instead of getting flagged in the first week.
9 min read
LinkedIn outreach
Your reply rate rarely collapses from one bad message. It bleeds out through a stack of small mistakes: an over-pitched connection note, a thin profile, volume your account never earned. Here is what to fix first.
9 min read
Your SSI is a 0-100 number LinkedIn calculates from four behaviors, each worth 25 points. It is a proxy, not a ranking lever. Here is what moves it and what to ignore.
8 min read
LinkedIn outreach
Send-time tweaking earns you single-digit percentage gains at best. Targeting, relevance, and a warm sender account are where the real reply-rate differences live. Here is how to think about both.
8 min read
LinkedIn restrictions are not random. They follow patterns you can read, recover from, and design around. Here is the playbook for getting your account back and keeping it.
9 min read
LinkedIn outreach
Most LinkedIn dashboards reward the wrong behavior. Here are the metrics that actually predict booked meetings, the ones that just make you feel busy, and how to instrument tracking without drowning in a spreadsheet.
9 min read
Linkedin outreach
Most LinkedIn outreach fails before it's sent, because the sender never read the profile. Here's the research process that finds a real reason to message someone, and the signals worth ignoring.
9 min read
LinkedIn outreach
Most LinkedIn outreach is cold because the sender and the recipient have nothing in common except a sales pitch. Shared groups and event attendance change that. This is how to find, join, and work them without being the person everyone mutes.
9 min read
Deliverability
If Google Postmaster Tools or your warmup dashboard is showing a low domain reputation, something in your sending history has flagged your domain as a risk. Here is how to find the cause and fix it.
9 min read
Cold email
No replies does not always mean bad copy. It can mean your emails are going to spam, reaching the wrong people, or arriving at the wrong time. Here is how to tell the difference and fix the right thing.
11 min read
Inbox placement
Your campaign tool says 'delivered'. That does not mean anyone saw it. Inbox placement is the metric that tells you whether your email landed somewhere the recipient will actually look.
8 min read
Cold email
A bounce rate above 2% will hurt your deliverability faster than almost any other mistake. Here is what counts as a bounce, why it happens in cold email, and the fix.
9 min read
Infrastructure
Most cold email campaigns fail before a single word is read. The domain is unaged, the DNS is misconfigured, the mailbox was never warmed. This guide covers the full setup, layer by layer.
12 min read
Blacklist
Getting listed on an email blacklist can quietly kill your deliverability before you even notice. Here is what blacklists are, why they exist, and exactly what to do if you end up on one.
8 min read
Domain Health
Most deliverability problems are visible before they show up in your reply rate. Here is how to audit your sending domain in under 30 minutes and know exactly what to fix.
8 min read
Cold email
Cold email lives or dies in the setup phase. Get the infrastructure right before you write a single line of copy and everything else is easier. Get it wrong and no tool will save you.
14 min read
Sender Reputation
Sender reputation is the invisible score that decides whether your emails land in the inbox or the spam folder. Here is what it actually measures, and how to build it properly.
9 min read
Outlook
Outlook's junk folder catches more cold email than most senders realise. The fix is not always obvious, because Outlook weights signals very differently from Gmail. Here is the diagnostic, step by step.
8 min read
Metrics
If your reply rate is steady, deliverability must be fine, right? Not quite. Reply rate measures the people who saw your message. It tells you nothing about the people whose copies went straight to spam.
9 min read
Comparison
All three warm your mailboxes and send your campaigns. They differ on what they meter, how they handle LinkedIn, and how deep the deliverability tooling goes. Here is the honest comparison, including where we (Warmerly) lose.
10 min read
DNS
Three records, three jobs, one chain. Get the chain right and most deliverability problems vanish before you ever touch warmup or copy.
9 min read
Gmail
Your campaign lands in Gmail's inbox but Outlook's junk, or the other way around. The two providers use very different signals. Here is how to optimise for both.
10 min read
Gmail
Gmail's spam filter is the toughest in the business. If your mail is landing there, the fix is rarely a few changed words; it is usually two or three problems at once. Here is how to find them and the order to fix them in.
9 min read
DNS
Three DNS records stand between cold email and the inbox. Here are the exact records to publish, what Gmail and Yahoo require since 2024, the alignment rule most guides skip, and how to check it all in five minutes.
9 min read
Everything here assumes a mailbox providers already trust. Building that is the slow, boring part, and it is the part Warmerly does for you. Free plan, no card required.
