Sync'ing two dovecot servers

Greetings,

I was pleased to see that dovecot has a sync function in doveadm. So far, other tools for moving mailbox contents from one server to another has not been successful.

However.

Perhaps I don't understand how this should work.  I have a new containerized dovecot v2.4.2

# 2.4.2 (0962ed2104): /etc/dovecot/dovecot.conf
# OS: Linux 6.12.63+deb13-amd64 x86_64

and I have an existing dovecot running in a VPS:

# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
# Pigeonhole version 0.5.19 (4eae2f79)
# OS: Linux 6.1.0-35-amd64 x86_64 Debian 12.11

I want to move one user, as a test.  I execute this in the container.

# doveadm sync  -R1 -u USER tcps:OLD_SERVER:993
doveadm(USER): Error: conn OLD_SERVER:993 (IP:993): doveadm server
sent invalid handshake: * OK [CAPABILITY IMAP4rev1 SASL-IR
LOGIN-REFERRALS ID ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=LOGIN]
Dovecot (Debian) ready.
doveadm(USER): Error: cmd sync: Disconnected from remote: Connection
closed

I'm pretty sure that doveadm sync was able to negotiate the TLS connection.  I don't see what it could object to in the sign-on. What am I missing?

Cheers

-- /Marc Oscar Singer/ *Woollysoft* Dial 817.1823.602.1+ from right to left.

Greetings,

I was pleased to see that dovecot has a sync function in doveadm. So far, other tools for moving mailbox contents from one server to another has not been successful.

However.

Perhaps I don't understand how this should work. I have a new containerized dovecot v2.4.2

 # 2.4.2 (0962ed2104): /etc/dovecot/dovecot.conf
 # OS: Linux 6.12.63+deb13-amd64 x86_64

and I have an existing dovecot running in a VPS:

 # 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf
 # Pigeonhole version 0.5.19 (4eae2f79)
 # OS: Linux 6.1.0-35-amd64 x86_64 Debian 12.11

I want to move one user, as a test. I execute this in the container.

 # doveadm sync  -R1 -u USER tcps:OLD_SERVER:993
 doveadm(USER): Error: conn OLD_SERVER:993 (IP:993): doveadm server sent
 invalid handshake: * OK [CAPABILITY IMAP4rev1 SASL-IR LOGIN-REFERRALS ID
 ENABLE IDLE LITERAL+ AUTH=PLAIN AUTH=LOGIN] Dovecot (Debian) ready.
 doveadm(USER): Error: cmd sync: Disconnected from remote: Connection
 closed

I'm pretty sure that doveadm sync was able to negotiate the TLS connection. I don't see what it could object to in the sign-on. What am I missing?

Cheers

-- Marc Oscar Singer Woollysoft Dial 817.1823.602.1+ from right to left.