Permanent SMTP error: permanent 5.5.2

dmei · July 14, 2024, 5:38pm

Hallo,
auf einem Iphone funktionierendes Profil wurde mit der klassischen Methode zu einem Windows 11 Desktop übertragen.
Deltachat lässt sich dort öffnen, aber es werden keine Nachrichten versendet oder empfangen.
Es erscheint die Fehlermeldung:
“Error: Permanent SMTP error: permanent: 5.5.2
<[2a02:908:1e4:b920::d250]>Helo command rejected: invalid ip address
Message-ID:; Mr. TdWT4SU6MJ-.PcnhKe2IraN@localhost
No hop Info”
Kann jemand helfen?

–
Dirk

link2xt · July 14, 2024, 6:41pm

Error “invalid ip address” is generated by Postfix check “reject_invalid_helo_hostname”. Delta Chat sends [127.0.0.1] as the HELO hostname which passes this check, so this cannot be a rejection from Postfix smtpd that Delta Chat connects to:

github.com

async-email/async-smtp/blob/52b55c57173c304597821df80979e1ba1d0377ac/src/extension.rs#L33-L41


      
          // The most compatible address.
          //
          // It passes Postfix checks
          // ```
          // smtpd_helo_restrictions = reject_invalid_helo_hostname, reject_non_fqdn_helo_hostname, reject_unknown_helo_hostname
          // smtpd_helo_required = yes
          // smtpd_delay_reject = no
          // ```
          Self::Ipv4(Ipv4Addr::new(127, 0, 0, 1))

Probably Postfix fails to send message further.

dmei · July 16, 2024, 9:30am

Many thanks for your answer.
Curiosly the error exits since adding a new profile with the team managed mail server nine.testrun.org.
A formerly created profile on the same PC with mail server mail.de works fine. So it looks like the new profile or the mailserver is reasonable for the error message.
But I do not know a way to fix.

Minim · June 19, 2025, 1:30am

I had a similar problem trying to config Neomutt to use a chatmail address (to load the public key of a correspondent into a Deltachat client; a kludge).

Neomutt could download mails but not send them. I got this message:

msmtp: server message: 504 5.5.2
: Helo command
rejected: need fully-qualified
hostname
msmtp: could not send mail
(account
xxxxxxxx@nine.testrun.org from
/home/mobian/.msmtprc)

I’ll post any progress, comments welcome.

Minim · June 19, 2025, 6:03pm

I added

domain 127.0.0.1

to ~/.msmtprc

Result is that sending hangs forever, then:
msmtp: recipient address
xxxxxxxx@nine.testrun.org not
accepted by the server
msmtp: server message: 504 5.5.2
<127.0.0.1>: Helo command
rejected: need fully-qualified
hostname
msmtp: could not send mail
(account
xxxxxxxx@nine.testrun.org from
/home/mobian/.msmtprc)

So this is maybe unrelated. Suggestions, ideas?

link2xt · June 19, 2025, 10:29pm

It should be domain [127.0.0.1] instead of domain 127.0.0.1. This is also what Delta Chat sends in EHLO.