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Hi, you should check your Workmail Access Control Rules: they are very often the root cause of such 403 (Forbidden) errors. You may have one that blocks users
See https://docs.aws.amazon.com/workmail/latest/adminguide/access-rules.html
Administrators can apply access control rules that allow or deny access
based on the following criteria:
Protocols – The protocol used to access the mailbox. Examples
include Autodiscover, EWS, IMAP, SMTP, ActiveSync, Outlook for
Windows, and Webmail.
IP addresses – The IPv4 CIDR ranges used to access the mailbox.
Amazon WorkMail users – The users in your organization that are
used to access the mailbox.
Impersonation roles – The impersonation roles in your organization
that are used to access the mailbox. For more information,
see Managing impersonation roles.
Hope it helps! Didier
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