On 18 Jul 2020, at 07:25, ratatouille <ratatoui...@bitclusive.de> wrote:
> mail_version = 3.3.1
This is quite old. The current version of 3.3.x is 3.3.12.
> Jul 18 14:55:12 dualbit1 postfix/smtpd[493943]:
> p57b62c8e.dip0.t-ipconnect.de[87.182.44.142]: TLS cipher list
> "aNULL:-aNULL:HIGH:MEDIUM:+RC4:@STRENGTH:!aNULL"
I don't see a line like this in my logs. Are you setting a custom set of
ciphers? This looks like tls_medium_cipherlist.
> Jul 18 14:55:12 dualbit1 postfix/smtpd[493943]: SSL3 alert
> write:fatal:protocol version
> Jul 18 14:55:12 dualbit1 postfix/smtpd[493943]: SSL_accept:error in error
> Jul 18 14:55:12 dualbit1 postfix/smtpd[493943]: SSL_accept error from
> p57b62c8e.dip0.t-ipconnect.de[87.182.44.142]: -1
> Jul 18 14:55:12 dualbit1 postfix/smtpd[493943]: warning: TLS library problem:
> error:14209102:SSL routines:tls_early_post_process_client_hello:unsupported
> protocol:ssl/statem/statem_srvr.c:1661:
What does this look like owhen your Claws MIA connects?
But the basic answer is your android device and your mail server cannot find a
common secure protocol. This is normally caused by you restricting security
protocols or, less commonly, by a client that is trying to downgrade security.
I am pretty sure that you need to update you postfix and your openssl (or
whatever package you are using for TLS).
I am suspicious of your "SSL3" in there as that should absolutely not be used,
and the default in postfix is
smtpd_tls_mandatory_protocols = !SSLv2, !SSLv3
--
"A musicologist is a man who can read music but can't hear it." -
Sir Thomas Beecham (1879 - 1961)
