I have client with 10 users that was formally hosting with google workspace (gmail) for their domain. I am in the process of migrating them to my SmarterMail server where hosting will cost much less. Each user has about 40GB of email. I have already setup the domain and the 10 years within smartermail. I have not pointed the DNS yet. Using the built in MIgration tool I am in the process of migrating all their data to smartermail, but the migration fails for some users for unknown reasons. I did check the IMAP retrival logs and it does show Google timing out the IMAP connections after a few minutes.
Smartermail trys to grab lets say 80 emails from a folder. It is able to get a limited number of them, before gmail times out the IMAP connection. Then it waits and trys again later picking up where it left off.
Of the 6 users I started the migration process only one seems to still be moving data. The other 5 stopped. Here are the logs for one of them. This user has 40GB of data, the first time only 13 GB were moved before it failed. I restarted the migration a second time and only 4.22GB were transferred.
[2026.09.16] at SmarterMail.MailService.RelayServer.Clients.IMAP.丅丝.AuthenticatePlain(IImapAccountV1Readonly account)
[2026.09.16] at SmarterMail.MailService.RelayServer.MessageRetrieval.丄俌.DownloadMessages(丄俙 trackingFile)
[2026.09.16] 00:49:25.247 [882] Finished processing for
user@domain.com [d67da20e500a4ef9a885e189a54aba86]
Any thoughts on what the problem could be and how to resolve this?