Reddit’s take on email warmup is more balanced than most tool vendors suggest. In r/AskMarketing and r/Coldemailing threads, the rough consensus is that warming up a brand-new domain or inbox helps, but it is not magic, and it will not save bad targeting, weak copy, or a domain whose reputation is already damaged.
When Redditors say warmup helps
The one thing almost everyone agrees on is a gradual ramp. In the r/AskMarketing thread asking whether email warmup is worth it, users suggest starting with five to ten emails a day from a new domain and increasing slowly over about three weeks, rather than jumping from zero to hundreds overnight. Several report that new Gmail accounts get flagged within a couple of weeks when they send bulk mail immediately, no matter how smart Google claims to be about it.
The mechanics, as one longer r/Coldemailing post explained, are less about sending a few emails and more about positive engagement. Warmup networks exchange mail across thousands of mailboxes so messages get opened, replied to, and pulled back out of spam, which builds the early trust signals a fresh mailbox has not earned yet. Our full email warmup guide covers the day-by-day ramp schedule and the complaint and bounce thresholds to stay under.
The limits Redditors keep pointing out
The same caveats surface again and again:
- Warmup will not fix an already-damaged reputation. In one r/salesdevelopment thread, a poster whose open rate fell from 45% to 11% in a month was told to check postmaster.google.com first, since a spam-trap hit or a flagged domain often needs a fresh domain rather than more warming.
- Authentication comes first. If SPF, DKIM, and DMARC are not configured correctly, no amount of warming lands you in the inbox.
- If you send through an established ESP on shared IPs, warming your own inbox may be unnecessary, because the shared pool already carries a reputation.
- Redditors are openly skeptical of warmup-tool recommendations that read like sales pitches, so treat vendor claims with caution.
The recurring theme across every thread is that warmup is one input to deliverability, not the whole equation. It pairs with a clean sender reputation and correct authentication, and if your mail is already landing in spam, the reasons emails go to spam usually need fixing before any warmup tool will help.
I’ve spent my career building software at scale with a soft spot for email: deliverability, lifecycle campaigns, and getting messages to actually land. I started Coldletter to fix what bugged me about transactional and marketing email tools. I’m based in Vancouver.