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Another solution to this problem is relaying through services which will do the heavy lifting for you (this was been discussed in the original thread, here and

Another solution to this problem is relaying through services which will do the heavy lifting for you (this was been discussed in the original thread, here and in the article I wrote). So far people have suggested: - ImprovMX (https://improvmx.com https://improvmx.com) - Mailgun (https://mailgun.com https://mailgun.com) - Postmark (https://postmarkapp.com https://postmarkapp.com) Commenting for visibility: as any others come in I will update this comment (until I can't, anyway) and the article as a reference.

deepspace 4y ago
But if you go that fire, you might as well use a third party for the entire stack. If you would rather not use the big 3/4/5, use something like Fastmail. They are an extremely reliable email provider, without the baggage of Google/Microsoft.
- hardwaresofton 4y ago
  I’d rather use Proton Mail since they’re in a country with reasonable privacy/encryption laws, and generally don’t welcome government over reach.
bounder 4y ago
A good addition to this list is https://postmarkapp.com/ https://postmarkapp.com/. They are meet EU law in regards to the GDPR. They don’t have a free tier for their relay service, but do have a nice free reporting tool for DMARC.
- linker3000 4y ago
  Can agree with this. Having slogged through the learning process of setting up DMARC and DKIM to supplement SPF, this site was a great help and allowed me to confirm my setup (Postfix and Dovecot) was behaving as expected and needed. The only issue I have with a Postfix setup is providing an easy-to-use out of office auto-reply facility - I have tried the manual approach and also some scripted solutions but they don't seem to work reliably and, inevitably, I get comments from colleagues (it's a small, family-run business), that they just want to be able to turn on an auto-reply in Outlook (which is used as a front end for multiple inboxes on different mail services) and for it to 'just work'.

deepspace 4y ago

But if you go that fire, you might as well use a third party for the entire stack. If you would rather not use the big 3/4/5, use something like Fastmail. They are an extremely reliable email provider, without the baggage of Google/Microsoft.

hardwaresofton 4y ago
I’d rather use Proton Mail since they’re in a country with reasonable privacy/encryption laws, and generally don’t welcome government over reach.

bounder 4y ago

A good addition to this list is https://postmarkapp.com/ https://postmarkapp.com/. They are meet EU law in regards to the GDPR. They don’t have a free tier for their relay service, but do have a nice free reporting tool for DMARC.

linker3000 4y ago
Can agree with this. Having slogged through the learning process of setting up DMARC and DKIM to supplement SPF, this site was a great help and allowed me to confirm my setup (Postfix and Dovecot) was behaving as expected and needed. The only issue I have with a Postfix setup is providing an easy-to-use out of office auto-reply facility - I have tried the manual approach and also some scripted solutions but they don't seem to work reliably and, inevitably, I get comments from colleagues (it's a small, family-run business), that they just want to be able to turn on an auto-reply in Outlook (which is used as a front end for multiple inboxes on different mail services) and for it to 'just work'.