Panic: file smtp-address.c: line 530 (smtp_address_write): assertion failed: (smtp_char_is_qpair(*p))

A.L.E.C alec at
Sun Mar 4 09:08:03 EET 2018

On 03/02/2018 03:32 PM, Ralf Hildebrandt wrote:
> The address causing the error is:
> From: =?utf-8?Q?Dorit_M=C3=BCller?= <d.müller at>
> Note the "umlaut" in the email address... :)

This is about SMTPUTF8 (RFC6531). Looks like your only option is to disable
smtputf8_enable in Postfix config. Of course Dovecot should never panic, so a fix for this
would be nice, separately from the SMTPUTF8 support.

Aleksander 'A.L.E.C' Machniak
Kolab Groupware Developer         []
Roundcube Webmail Developer   []
PGP: 19359DC1 # Blog:

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