Why am I having problems sending mail from my IMAP mail client?

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SMTP server configuration

Typically, problems sending messages indicate that your outbound (SMTP) server is configured incorrectly. If this is the case, you may receive messages similar to the following:

"The recipient dvader [or whoever is in the "To:" field] is not acceptable to your SMTP server. The message is unsendable until the recipient has been changed."
"550 <dvader@empire.gov> Relaying Denied."

To correct the problem, at any Indiana University campus except IPFW (which uses the POP protocol and its own SMTP servers), in the configuration of your mail software, set the outbound (SMTP) server to:

 mail-relay.iu.edu
Notes:
  • If you connect to IU computing systems through most outside Internet service providers (ISPs), for your IMAP software's outbound server setting, you can use either mail-relay.iu.edu or your ISP's outgoing server setting. However, if you are required to use your ISP's SMTP server, substitute that server's name for mail-relay.iu.edu. Also, check with your ISP to determine whether its SMTP server requires authentication, and SSL or TLS.
  • If possible, use Exchange ActiveSync.

This is document aeip in the Knowledge Base.
Last modified on 2017-02-02 12:30:44.

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