[Mailman-Users] Meaning of "Postfix SMTP server: errors from dd11328.otherdomain.tld[ip.ip.ip.ip]"
kalabalik at gmx.net
Tue May 10 19:16:28 EDT 2016
thank you for your helpful reply although your answer shows that my
question was off the list topic.
Am 10.05.2016 um 17:24 schrieb Mark Sapiro:
> On 5/9/16 2:04 PM, Kala Balik wrote:
>> today we ran our first mailing over our new Mailman instance. We
>> received a few bounces and the following email which left me clueless.
>> Please, what is this message trying to tell me? Is this us sending out,
>> or is this someone trying to answer to our mailing (and failing to log
>> in via TLS)? I checked my /var/log/mail logs - to no avail.
> This apparently has nothing directly to do with Mailman on your server.
>> Transcript of session follows.
>> Out: 220 lists.domain.tld ESMTP Postfix (Ubuntu)
>> In: EHLO dd11328.otherdomain.tld
>> Out: 250-lists.domain.tld
>> Out: 250-PIPELINING
>> Out: 250-SIZE 10240000
>> Out: 250-VRFY
>> Out: 250-ETRN
>> Out: 250-STARTTLS
>> Out: 250-ENHANCEDSTATUSCODES
>> Out: 250-8BITMIME
>> Out: 250 DSN
>> In: STARTTLS
>> Out: 454 4.7.0 TLS not available due to local problem
>> In: MAIL FROM:<> SIZE=236
>> Out: 250 2.1.0 Ok
>> In: RCPT TO:<list-bounces at lists.domain.tld>
>> ORCPT=rfc822;list-bounces at lists.domain.tld
>> Out: 250 2.1.5 Ok
>> In: RSET
>> Out: 250 2.0.0 Ok
>> In: QUIT
>> Out: 221 2.0.0 Bye
> It looks to me like the server that identifies itself as
> dd11328.otherdomain.tld started to send a message (probably a legitimate
> bounce of a list message) to <list-bounces at lists.domain.tld>. It send
> the RCPT TO:, was sent an OK in reply and then instead of sending the
> DATA, reset the connection and quit. Possibly this is because the
> sending server requires TLS which your Postfix says is not available.
> Why your Postfix decided to notify you of this is a Postfix question.
> I suggest you set both
> smtp_tls_security_level = may
> smtpd_tls_security_level = may
> in your Postfix main.cf so that you accept incoming TLS if offered and
> offer outgoing TLS. You will also need to set smtpd_tls_cert_file and
> smtpd_tls_key_file and maybe others. See
Will implement these postfix changes as soon as possible.
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