Reply by email does not work

Hi,

I have gitlab-ce hosted 15.8.1. Up until not long ago I was using the reply by email function without any issues. I do not know since when but it does not work anymore. If I reply as usual then the reply is not posted on the issue I reply to.

I checked the gitlab logs and there’s no error. I can see that gitlab is connecting and retrieving the email from the email account but it is just not posting the reply.

This is what I have configured in gitlab.rb:

gitlab_rails['incoming_email_enabled'] = true
gitlab_rails['incoming_email_address'] = "gitlab-incoming+%{key}@domain.com"
gitlab_rails['incoming_email_email'] = "gitlab-incoming@domain.com"
gitlab_rails['incoming_email_password'] = "PASSWORD"
gitlab_rails['incoming_email_host'] = "imap.gmail.com"
gitlab_rails['incoming_email_port'] = 993
gitlab_rails['incoming_email_ssl'] = true
gitlab_rails['incoming_email_start_tls'] = false
# The mailbox where incoming mail will end up. Usually "inbox".
gitlab_rails['incoming_email_mailbox_name'] = "inbox"
gitlab_rails['incoming_email_idle_timeout'] = 60

And this is what I see in the logs regarding this:

{"severity":"INFO","time":"2023-02-01T12:55:14.462+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Setting up watcher"}
{"severity":"INFO","time":"2023-02-01T12:55:14.463+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Starting TLS session"}
{"severity":"INFO","time":"2023-02-01T12:55:14.463+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Logging into mailbox"}
{"severity":"INFO","time":"2023-02-01T12:55:15.306+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Setting mailbox"}
{"severity":"INFO","time":"2023-02-01T12:55:15.446+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Processing started"}
{"severity":"INFO","time":"2023-02-01T12:55:15.674+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"uid":6615,"action":"asking arbiter to deliver","arbitrator":"MailRoom::Arbitration::Redis"}
{"severity":"INFO","time":"2023-02-01T12:55:15.697+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Getting new messages","unread":{"count":1,"ids":[6615]},"to_be_delivered":{"count":1,"ids":[6615]}}
{"severity":"INFO","time":"2023-02-01T12:55:16.130+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"uid":6615,"action":"sending to deliverer","deliverer":"MailRoom::Delivery::Postback","byte_size":5673}
{"severity":"INFO","time":"2023-02-01T12:56:16.136+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Quitting connection..."}
{"severity":"INFO","time":"2023-02-01T12:56:16.136+01:00","context":{"email":"gitlab-incoming@domain.com","name":"inbox"},"action":"Terminating watching thread..."}

None of the other discussions on this matter from the forum helped solve this. I did search a lot on this issue before creating the topic.

Please help.
Thanks in advance.