Mail blocked by Google

[Daniel Shahaf]

Vordoo wrote on Sun, 16 May 2021 11:28 +00:00:
> On 5/16/21 6:48 AM, אורי wrote:
> > May 16 04:00:01 www postfix/smtp[1364]: 79264BD01C: to=<webmaster+root-crontab at speedy.net <mailto:webmaster%2Broot-crontab at speedy.net>>, relay=aspmx.l.google.com[142.250.27.27]:25, delay=0.13, delays=0.02/0.01/0.02/0.07, dsn=5.7.1, status=bounced (host aspmx.l.google.com[142.250.27.27] said: 550-5.7.1 [157.245.76.159      18] Our system has detected that this message is 550-5.7.1 _*likely suspicious due to the very low reputation *_of the sending IP 550-5.7.1 address. To best protect our users from spam, the message has been 550-5.7.1 blocked. Please visit 550 5.7.1  https://support.google.com/mail/answer/188131 for more information. bo27si207201edb.287 - gsmtp (in reply to end of DATA 
> 
> For a long time now it's becoming a real nuisance to self host email 
> servers. You need a static IP with clean / good reputation + nspf, 
> dkim, dmarc and all that

At last count: MTA-STS, MX, SPF, DMARC, TLS-RPT, DKIM, CSA, SRV, and
a few "prove to $thirdparty that I own this domain" records for various
third parties.  And even then, a new outbound IP requires a slow
warm-up etc..

It's definitely a lot easier to use a relayhost.

> while most your mail will be routed trough google anyway. It's
> probably only worth it for big setups or educational purposes.