I set-up a smtp server with OpenSMTPD to be used from outside with clients like thunderbird, ...

Sometimes, when I send a mail, it's very long to send and finally, I get this error after waiting a few minutes (thunderbird) but the mail is sent correctly:

Sending of message failed.
The message could not be sent because the connection to SMTP server bsd.zplay.eu timed out. Try again or contact your network administrator.

Here is my smtpd.conf

#-----------------------
listen on lo0
listen on egress tls certificate bsd.zplay.eu auth-optional
table aliases db:/etc/mail/aliases.db
accept from any for local alias <aliases> deliver to mbox
accept from any for domain "xn--libert-gva.info" alias <aliases> deliver to mbox
accept from local for any relay
#-----------------------



The log with smtpd -dv while sending the mail :


-----------------
smtpd -dv | tee /home/charles/log.txt
info: OpenSMTPD 5.3.2 starting
debug: bounce warning after 4h
debug: using "fs" queue backend
debug: using "ramqueue" scheduler backend
debug: using "ram" stat backend
info: startup [debug mode]
debug: init server-ssl tree
info: No CA found in /etc/mail/certs/bsd.zplay.eu.ca
info: No DH parameters found in /etc/mail/certs/bsd.zplay.eu.dh: using built-in parameters
info: No CA found in /etc/mail/certs/bsd.zplay.eu.ca
info: No DH parameters found in /etc/mail/certs/bsd.zplay.eu.dh: using built-in parameters
debug: init client-ssl tree
debug: parent_send_config_ruleset: reloading
debug: parent_send_config_mfa: reloading
debug: parent_send_config: configuring smtp
debug: smtp: listen on IPv6:fe80::222:4dff:fe88:e123%em0 port 25 flags 0x9 cert "bsd.zplay.eu"
debug: mfa ready
debug: smtp: listen on 178.32.221.36 port 25 flags 0x9 cert "bsd.zplay.eu"
debug: smtp: listen on 127.0.0.1 port 25 flags 0x0 cert ""
debug: smtp: listen on IPv6:fe80::1%lo0 port 25 flags 0x0 cert ""
debug: smtp: listen on IPv6:::1 port 25 flags 0x0 cert ""
debug: smtp: will accept at most 500 clients
debug: queue: done loading queue into scheduler
debug: smtpd: scanning offline queue...
debug: smtpd: offline scanning done

debug: smtp: new client on listener: 0x85e10170
smtp-in: New session 00000000e01e295a from host 89-93-87-157.hfc.dyn.abo.bbox.fr [89.93.87.157]
debug: session_start_ssl: switching to SSL
smtp-in: Started TLS on session 00000000e01e295a: version=TLSv1/SSLv3, cipher=DHE-RSA-AES256-SHA, bits=256 smtp-in: Accepted authentication for user charles on session 00000000e01e295a
debug: smtp: SIZE in MAIL FROM command
debug: 0x802a0000: end of message, msgflags=0x0000
smtp-in: Accepted message 59b5ac98 on session 00000000e01e295a: from=<[email protected]>, size=6305, nrcpts=1, proto=ESMTP
debug: scheduler: evp:59b5ac98c0ec485e scheduled (mta)
smtp-in: Received disconnect from session 00000000e01e295a
debug: smtp: 0x802a0000: deleting session: disconnected
debug: mta: received evp:59b5ac98c0ec485e for <*@gmail.com>
debug: mta: draining [relay:gmail.com] refcount=1, ntask=1, nconnector=0, nconn=0
debug: mta_query_mx(gmail.com)
debug: mta: [relay:gmail.com] waiting for MX
debug: MXs for domain gmail.com:
        173.194.66.27 preference 5
        IPv6:2a00:1450:400c:c03::1b preference 5
        173.194.70.27 preference 10
        IPv6:2a00:1450:4001:c02::1a preference 10
        173.194.69.27 preference 20
        IPv6:2a00:1450:4008:c01::1a preference 20
        173.194.71.26 preference 30
        IPv6:2a00:1450:4010:c03::1a preference 30
        74.125.25.27 preference 40
        IPv6:2607:f8b0:400e:c03::1b preference 40
debug: mta_on_mx(0x889da090, gmail.com, [relay:gmail.com])
debug: mta: draining [relay:gmail.com] refcount=1, ntask=1, nconnector=0, nconn=0 debug: mta: trying to create new connection: refcount=1, ntask=1, nconnector=0, nconn=0
debug: mta: need new connector (attempt 1)
debug: mta: using default source
debug: mta: new connector []->[relay:gmail.com]
debug: mta: trying to create new connection: refcount=1, ntask=1, nconnector=1, nconn=0
debug: mta: using connector []->[relay:gmail.com]
debug: mta_connect() for []->[relay:gmail.com]
debug: mta: putting []->[relay:gmail.com] on delay queue
debug: mta: 0x7fbe3b00: spawned for relay [relay:gmail.com]
smtp-out: Connecting to smtp://173.194.66.27:25 (we-in-f27.1e100.net) on session 000000029a9f1040...
smtp-out: Connected on session 000000029a9f1040
debug: mta: route ok [] <-> 173.194.66.27 (we-in-f27.1e100.net)
debug: mta: 0x7fbe3b00: handling next task for relay [relay:gmail.com]
relay: Ok for 59b5ac98c0ec485e: session=000000029a9f1040, from=<[email protected]>, to=<**@gmail.com>, source=178.32.221.36, relay=173.194.66.27 (we-in-f27.1e100.net), delay=1m42s, stat=250 2.0.0 OK 1370892448 r7si3
784771wiz.70 - gsmtp
debug: mta: 0x7fbe3b00: no task for relay [relay:gmail.com]
smtp-out: Closing session 000000029a9f1040: 1 message sent.
debug: mta: 0x7fbe3b00: session done
debug: mta: route collect [] <-> 173.194.66.27 (we-in-f27.1e100.net)
debug: mta: putting []->[relay:gmail.com] on delay queue
debug: mta: draining [relay:gmail.com] refcount=1, ntask=0, nconnector=1, nconn=0
debug: mta: all done for [relay:gmail.com]
debug: mta: freeing [relay:gmail.com]
------------------------



I sent a "Lorem Ipsum" message to try, and it blocked. If I send very small messages it works nicely.

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