On 6/1/2015 4:19 PM, @lbutlr wrote:
> A user at a Starbucks is trying to send mail and getting an error on sending. 
> This is what I see in the logs:
> 
> Jun  1 15:09:08 mail submit-tls/smtpd[88479]: warning: hostname 
> 50-253-97-91-static.hfc.comcastbusiness.net does not resolve to address 
> 50.253.97.91: hostname nor servname provided, or not known
> Jun  1 15:09:08 mail submit-tls/smtpd[88479]: connect from 
> unknown[50.253.97.91]
> Jun  1 15:09:08 mail submit-tls/smtpd[88479]: SSL_accept error from 
> unknown[50.253.97.91]: lost connection
> Jun  1 15:09:08 mail submit-tls/smtpd[88479]: lost connection after STARTTLS 
> from unknown[50.253.97.91]
> Jun  1 15:09:08 mail submit-tls/smtpd[88479]: disconnect from 
> unknown[50.253.97.91]
> 
> and this is what I have for submission:
> 
> submission inet  n       -       n       -       -       smtpd
>     -o smtpd_tls_security_level=encrypt
>     -o smtpd_sasl_auth_enable=yes
>     -o smtpd_sasl_type=dovecot
>     -o smtpd_sasl_security_options=noanonymous
>     -o smtpd_sasl_path=private/auth
>     -o smtpd_client_restrictions=permit_sasl_authenticated,reject
>     -o smtpd_data_restrictions=
>     -o 
> smtpd_relay_restrictions=permit_sasl_authenticated,reject_unauth_destination,reject
>     -o smtpd_helo_restrictions=
>     -o 
> smtpd_recipient_restrictions=permit_sasl_authenticated,reject_unauth_destination,reject
>     -o syslog_name=submit-tls
> 
> Is there anything that I have set that is causing this to fail? (My own 
> connection is also a Comacastbusiness.net IP, and I connect without issues).
> 


This looks as if the client and the server don't have a common
cipher enabled.

What are your postconf -n settings?  Do you know what the client
software and OS are?



  -- Noel Jones

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