Fwd: Everything works except sending mail

Armin Tangelder a.tangelder at gmail.com
Tue Mar 20 13:04:36 EET 2018

Hi people,

Version of my beloved Dovecot installation:

2.2.27 (c0f36b0)

I moved from a OS X server to a Linux (Ubuntu) Headless server.
All fun and good to play around with. Love almost everything.

In the combination with Postfix and Dovecot I’m stuck to despair into

Everything works except I cannot send mail from my (OS X) Outlook client I
keep getting:

Connection to the server failed or was dropped. Error Code -3253

Nothing More and nothing less. O do not get any other error in a logfile or
And I followed almost every installation manual I found. Postfix I can send
and receive through telnet.
But I just can’t get this to work…

The mail doesn’t even reach Postfix queue as I cannot connect to send.
I do have a awesome connection receiving my mail though ☺


dovecot -n gives this (and I probably don’t see it anymore as I’ve been at
this for several days now)

# 2.2.27 (c0f36b0): /etc/dovecot/dovecot.conf

# Pigeonhole version 0.4.16 (fed8554)

# OS: Linux 4.13.0-37-generic x86_64 Ubuntu 17.10

auth_mechanisms = plain login

auth_realms = formule1.demon.nl

login_greeting = Dovecot ready.

mail_location = maildir:~/Maildir

mail_max_userip_connections = 50

namespace inbox {

  inbox = yes

  location =

  mailbox Drafts {

    special_use = \Drafts


  mailbox Junk {

    special_use = \Junk


  mailbox Sent {

    special_use = \Sent


  mailbox "Sent Messages" {

    special_use = \Sent


  mailbox Trash {

    special_use = \Trash


  prefix =


passdb {

  driver = pam


protocols = imap

service auth {

  unix_listener /var/spool/postfix/private/auth {

    group = postfix

    mode = 0666

    user = postfix



ssl_cert = </etc/ssl/certs/server.crt

ssl_key =  # hidden, use -P to show it

userdb {

  driver = passwd


Anything useful I would love to see.
Any information needed.




Very funny Scotty, now beam down my clothes…
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