Looks like your mail server is down:
host newpipe.schabi.org
newpipe.schabi.org has address 88.99.208.206
newpipe.schabi.org has IPv6 address 2a01:4f8:10a:39cd::32:1
newpipe.schabi.org mail is handled by 10 mail.commandnotfound.org.
host mail.commandnotfound.org
mail.commandnotfound.org has address 88.99.208.206
mail.commandnotfound.org has IPv6 address 2a01:4f8:10a:39cd::2:1
Nov 03 14:58:42 v220191283267104968 postfix/smtp[2716]: connect to mail.commandnotfound.org[2a01:4f8:10a:39cd::2:1]:25: Connection timed out
The whole NewPipe infrastructure is down and we are aware of it, probably the server lost internet connection
The infrastructure is back on, so I think this issue is fixed.