Isaac Shea
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
Ah, that may explain it. Good to know, and thanks for the feedback on the documentation repo 😀
11 replies
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
That's interesting, from what I could tell that's not the behaviour I observed. When sending to Gmail addresses it returned
202 Accepted but never delivered. It wasn't left hanging, and didn't return an error. I suspect that this is because this isn't something MailChannels picks up because it's detected on the mailbox side? But I'm not hugely familiar with how email works so I could be wrong.11 replies
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
I'll take a look at it soon 😀
11 replies
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
Thank you! I'll have a look into doing that
11 replies
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
Alright, for anyone interested I've compiled a few important documents into one unofficial documentation repository on GitHub, hopefully helping a few people out in the future on the off chance they stumble across this!
https://github.com/zaccomode/better-cfw-mailer-docs
11 replies
CDCloudflare Developers
•Created by Isaac Shea on 7/19/2023 in #workers-help
Workers mailer not sending to Gmail domains
An update for anybody who cares: It was a DNS issue!
https://support.mailchannels.com/hc/en-us/articles/200262610-Set-up-SPF-Records
The above article explains that there needs to be an SPF record set up in the domain of the sender's email that allows emails to be sent from there. It seems that most email providers don't check for this fact, but as I suspected Gmail is a lot stricter on its checking and thus blocked everything from this unverified domain.
This article also linked to another one that explained locking domains down with MailChannels' Domain Lockdown to help impersonation, something I've now also interested
(here's the link to that for anyone who cares)
https://support.mailchannels.com/hc/en-us/articles/16918954360845-Secure-your-domain-name-against-spoofing-with-Domain-Lockdown-
This is the kind of thing that needs to be in some sort of centralized documentation by Cloudflare. The fact that I had to comb MailChannels' websites for solutions to this very large issue is insane to me. I'm going to make it my mission for today to setup a better documentation for this stuff that explains DNS, domain lockdown, etc. and post it somewhere useful, then update this when I'm done.
11 replies