This is a difficult issue to describe. We run GW CE 24.3.0. We have a GW domain that can send and receive email fine. GW Client users also have set up what I call external accounts using the top menu options [Accounts] and [Account Options]. Users can then set up access to Outlook and Comcast accounts (and others) by entering the POP, IMAP, and SMTP credentials. This works fine for incoming mail. However, occasionally, there is a glitch with outgoing mail.
Normally, if you select to use an external account in the [From] option on the client to send an outgoing message and you click the [send/retrieve] button, the outgoing message is sent through the external account servers. This must be as intended. When this works, it works great.
Sometimes, however, the GW Domain, notwithstanding the selection of an external account in the [From] field, takes hold of the mail message and tries to send it. This results in an error:
"Item to user(s) at gwdom was undeliverable, subject:___"
All users access the GW system in Online mode, not Cache mode.
Is there a way to fix this? As mentioned, it seems to happen 10% of the time, which significantly impacts our system's functionality. 90% of mail to an external domain works fine.