On 6 Jan 2023, at 08:53, Aki Tuomi <aki.tuomi@open-xchange.com> wrote:

On January 6, 2023 3:56:39 AM GMT+02:00, Gerben Wierda <gerben.wierda@rna.nl> wrote:
One step further in my quest to create a replacement mail server.

I now have my old mail server (, macOS + MacPorts) and my new (2.3.20, Alpine Linux, Docker, apk package). When I turn on replication it works, but, after a while I see:

Jan 06 00:50:31 replicator: Panic: data stack: Out of memory when allocating 268435496 bytes
Jan 06 00:50:32 replicator: Fatal: master: service(replicator): child 133 killed with signal 6 (core dumped)
Jan 06 00:50:32 lmtp(pid 195 user sysbh): Warning: replication(sysbh): Sync failure:
Jan 06 00:50:32 lmtp(pid 195 user sysbh): Warning: replication(sysbh): Remote sent invalid input: -

I've removed synchronous operation for now (found a message on the net suggesting that) but is this known and what does it mean?

Gerben Wierda (LinkedIn <https://www.linkedin.com/in/gerbenwierda>)
R&A IT Strategy <https://ea.rna.nl/> (main site)
Book: Chess and the Art of Enterprise Architecture <https://ea.rna.nl/the-book/>
Book: Mastering ArchiMate <https://ea.rna.nl/the-book-edition-iii/>

Dovecot default memory limit is 256M. You should probably set

service replicator {
 vsz_limit = 2G

because replicator might have to use more memory, especially for larger indexes.


That is a good tip as well. 

I had followed this bit of experience from someone else: https://marc.info/?l=dovecot&m=164438199727640, haven't seen any err message since. But that might be because they are in sync now and both sides are aware. Can I trigger full replication again so I can test?