Centos – Out of memory errors on imapsync

These look like fairly normal NDR's to me. Invariably when sending bulk email you're going to get some failures due to: spam filtering on the remote system, mailboxes that no longer exist, mailboxes that are full, etc., etc. Here's my take on what you posted:

xxxxxxxx@earthkink.net Your message wasn't delivered because of security policies. This is likely due to a spam filter on the recipient's end.

xxxxxxx.xxxxx@verizon.com The recipient's e-mail address was not found in the recipient's e-mail system. This means that the user doesn't have a mailbox on the remote system or doesn't have an email address matching the one you sent to.

xxxxxxx@aol.com The recipient's e-mail address was not found in the recipient's e-mail system. Same as above.

xxxxxxxx@prodigy.net There's a problem with the recipient's mailbox. This could mean any number of things, such as the recipient's mailbox being full.

Had the same errors here.

By appending the "--reconnectretry2" parameter with a value of 10 it works for me (didn't try any lower values).

That causes imapsync to re-establish the connection to the remote-server when it is being dropped.

Now only some errors for syncing messages with larger attachments remain for me. Didn't figure out exact size-limit yet or where I can adjust it.

I'm using imapsync 1.286, on Ubuntu (syncing from dovecot to exchange 2010 right now.)