I created a new wiki account on 2022-06-24 and have been unable to receive a confirmation email, so the account is extremely limited in its capabilities. We had one user in #gentoo report similarly. My email is hosted by gmail and the report in #gentoo was using gmail directly.
Sam checked the logs and said the email was in fact being sent out but it was getting stuck in 'Deferred'. I have no problem receiving bugmail to the same address. (Yes, I remembered to check the spam folder! :-))
I sent myself another confirmation around 2022-07-06 21:33 UTC or thereabouts.
06-15:27:07 <+robbat2> Jul 6 22:26:42 woodpecker postfix/smtp: send attr diag_text = 550-5.7.1 [2001:470:ea4a:1:5054:ff:fec7:86e4 7] Our system
has detected 550-5.7.1 that this message is likely unsolicited mail. To reduce the amount of 550-5.7.1 spam sent to Gmail, this
message has been blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 for more
Can you please try sending the activation email again? We'll probably need your help testing to see if any progress has been made. Thank you!
Triggered another one at 17:47 UTC, hasn't arrived yet, will keep an eye out.
No change in error:
Jul 7 17:46:53 woodpecker postfix/smtp: send attr reason = host ASPMX.L.GOOGLE.COM[2607:f8b0:400e:c09::1a] said: 550-5.7.1 [2001:470:ea4a:1:5054:ff:fec7:86e4 7] Our system has detected 550-5.7.1 that this message is likely unsolicited mail. To reduce the amount of 550-5.7.1 spam sent to Gmail, this message has been blocked. Please visit 550-5.7.1 https://support.google.com/mail/?p=UnsolicitedMessageError 550 5.7.1 for more information. e3-20020a654783000000b00412b10397b4si1058092pgs.664 - gsmtp (in reply to end of DATA command)
From the best of my understanding, it appears that the email is delivered successfully (but into the Spam folder) _if_ the receiving mailbox is hosted under a Google Workspace (formerly G Suite) account. This was kindly tested for me by someone with a @wikipedia.org email address.
If the receiving mailbox is an individual (free) Gmail account, then the message apparently does not go through at all. It doesn't show up in the Spam folder. It is simply not delivered due to 550-5.7.1.
For the record it was an @wikimedia.org email address.
Not sure how to describe my university's relationship with gmail, but I think there's money involved (just not mine). The email doesn't seem to show in Spam, but I'll give it another go (4:04 UTC). If I don't report back in, it didn't work. (I graduated from university quite some time ago, but I'm an "alumni for life" so it's still my email address all these years later)
User changing email address seems to be running into similar/same issue: