I am working with a customer who has a problem with outbound mail messages getting stuck in the outbox.
These messages originated from another application but it is using Outlook to sent the mail.
Soon after the message is send from the application, there is a complaint displayed with Microsoft Outlook in the title, saying: "A program is trying to automatically send e-mail on your behalf. Do you want to allow this. If this is unexpected, it may be a virus and you should choose 'No'."
Note that new mail can be interactively composed within Outlook and is sent promptly.
The customer is using Yahoo mail for all inbound and outbound email traffic
Another problem that is occurring, but I don't know whether it is related but it is annoying and strange, is that duplicate messages are accumulating in the Inbox.
The mail account is configured to delete the mail messages after they are downloaded from the mail server, which makes the opportunity for a duplicate odd because the original message is supposed to have already been deleted.
Btw: The size of the .pst file is about .25GB, well below the 2GB physical max.
Thank you in advance!