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Your company has recently implemented secure email across all offices. Mac users in a remote office are unable to send emails using Outlook for Mac but the PC users can send email with Outlook. What port needs to be configured on the clients and office firewall to allow email?
22
587
25
465
Secure email initially used port 465 but has been deprecated for port 587 since STARTTLS. Older email applications such as Entourage or Outlook for Mac do not support STARTTLS and so cannot use port 587. To correct the email problem port 465 would need to be opened on the office firewall and configured into the clients. Opening port 25 would not be correct because 25 is for normal SMTP without security, and would make the recent security changes pointless.
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