>> What is the size of the system memory on your dovecot server?  And
>> what is the size of the dovecot.index.cache file when you see this
>> error?  You should be able to delete the index and recreate it using
>> doveadm.
>> 
>Servers are with enough RAM the smallest one is 64GB. The memory I'm referring 
>is "vsz_limit=256 MB" and in my opinion it is not the issue but a consequence 
>of the large amount of links in the mail and from there large index file and 
>the result not enough memory to work with.
Try increasing the vsz_limit to 512m or even 1g. This can very well be (part 
of) the problem.
I have set default_vsz_limit = 1g and don't run into problems with imap_sieve 
calling the rspamd script to learn ham/spam.

-- 
Christian Kivalo
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