Dovecot 2.3.20 including it's submission server works well with all
sorts of clients, but Outlook.
Outlook works / can connect to Dovecot IMAP service with same
certificate TLS config, but it fails to connect using SMTPs on port 465.
Other clients connect and send mails without problem, also openssl
s_client can connect and reports no problems.
I tried with Outlook Version 365 on Windows 11 (no cloud) and
"Microsoft® Outlook® 2021 MSO (Version 2304 Build 16.0.16327.20200) 64-bit".
I already enabled all submission_client_workarounds and lowered
min_ssl_version from TLSv1.2 to TLSv1, but that changed nothing.
I can see nothing failing in the logs, thought the OL connection wizard
always check IMAP and SMTP together, so it's hard to say what the
problem is.
The same two Outlook version connect without a problem to Postfix
authenticating via SASL to Dovecot also requiring a minimum TLS version
of 1.2.
They just wont connect with Dovecot submission server.
Any ideas what's wrong, or how to debug that further?
Ralf
--
Ralf Becker
EGroupware GmbH [www.egroupware.org]
Handelsregister HRB Kaiserslautern 3587
Geschäftsführer Birgit und Ralf Becker
Leibnizstr. 17, 67663 Kaiserslautern, Germany
Telefon +49 631 31657-0
# 2.3.20 (80a5ac675d): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.20 (149edcf2)
# OS: Linux 4.19.0-23-amd64 x86_64 Ubuntu 20.04.6 LTS
# Hostname: testbox.egroupware.org
auth_master_user_separator = *
first_valid_uid = 90
log_path = /dev/stderr
mail_attribute_dict = file:%h/dovecot-metadata
mail_gid = dovecot
mail_location = mdbox:~/mdbox
mail_plugins = acl quota mail_lua notify push_notification push_notification_lua
mail_uid = dovecot
mail_vsize_bg_after_count = 100
managesieve_notify_capability = mailto
managesieve_sieve_capability = fileinto reject envelope encoded-character
vacation subaddress comparator-i;ascii-numeric relational regex imap4flags copy
include variables body enotify environment mailbox date index ihave duplicate
mime foreverypart extracttext
namespace inbox {
inbox = yes
location =
mailbox Archive {
auto = subscribe
special_use = \Archive
}
mailbox Drafts {
auto = subscribe
special_use = \Drafts
}
mailbox Junk {
auto = subscribe
special_use = \Junk
}
mailbox Sent {
auto = subscribe
special_use = \Sent
}
mailbox "Sent Messages" {
auto = no
special_use = \Sent
}
mailbox Templates {
auto = subscribe
}
mailbox Trash {
auto = subscribe
special_use = \Trash
}
prefix = INBOX/
separator = /
}
namespace users {
location = mdbox:%%h/mdbox
prefix = user/%%n/
separator = /
type = shared
}
passdb {
args = /etc/dovecot/dovecot-sql-master.conf.ext
driver = sql
master = yes
result_success = continue
}
passdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
plugin {
acl = vfile:/etc/dovecot/global-acls:cache_secs=300
acl_shared_dict = file:/var/dovecot/shared-mailboxes.db
push_lua_url = http://#hidden_use-P_to_show#@push:9501/
push_notification_driver = lua:file=/etc/dovecot/dovecot-push.lua
quota = count:User quota
quota_rule = *:storage=10GB
quota_vsizes = yes
sieve = file:~/sieve;active=~/.dovecot.sieve
}
protocols = " imap lmtp sieve pop3 submission"
service lmtp {
inet_listener lmtp {
port = 24
}
}
service submission-login {
inet_listener smtps {
port = 465
ssl = yes
}
}
ssl = required
ssl_cert = </etc/dovecot/certificate.pem
ssl_cipher_list =
ECDHE-ECDSA-AES128-GCM-SHA256:ECDHE-RSA-AES128-GCM-SHA256:ECDHE-ECDSA-AES256-GCM-SHA384:ECDHE-RSA-AES256-GCM-SHA384:ECDHE-ECDSA-CHACHA20-POLY1305:ECDHE-RSA-CHACHA20-POLY1305:DHE-RSA-AES128-GCM-SHA256:DHE-RSA-AES256-GCM-SHA384
ssl_dh = # hidden, use -P to show it
ssl_key = # hidden, use -P to show it
submission_client_workarounds = whitespace-before-path mailbox-for-path
implicit-auth-external
submission_host = smtp:25
submission_relay_host = smtp
submission_relay_trusted = yes
userdb {
driver = prefetch
}
userdb {
args = /etc/dovecot/dovecot-sql.conf.ext
driver = sql
}
protocol lmtp {
mail_plugins = acl quota mail_lua notify push_notification
push_notification_lua sieve
}
protocol imap {
imap_metadata = yes
mail_plugins = acl quota mail_lua notify push_notification
push_notification_lua acl imap_acl quota imap_quota
}
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