Beginning August 1, 2017, sending email to the Internet-at-large needs to use authenticated-SMTP and go through message hygiene (anti-spam and anti-virus scanning) to be successful. Office 365 Exchange Online (O365) is the preferred solution as it provides both.

For University of Iowa systems which cannot use O365, the system known as will continue to be available with two changes: (1) it will no longer provide message hygiene, and (2) it will only accept messages directed to University of Iowa O365 domain names,(e.g.,,,,  It is recommended that you have a valid mailbox to send from when using

If you are using or, you will be required to:

  1. have a mailbox in the University of Iowa O365 domain. (e.g.,,,,
  2. use the mailbox email alias or other SMTP address stamped on the mailbox as the From address in your message
  3. authenticate using the mailbox account ID/Service ID and password.  If the password is not known then the account owner can call the ITS Help Desk at (319) 384-4357 to have it reset.

If you need a mailbox created, see

Email submission choices

The following chart summarizes the available choices for submitting email from campus.
sending server IP campus GSA campus LSA or data center campus GSA or LSA
authenticated SMTP required required not available
recipient email address any any O365 domain only
Require Encryption Yes (SSL or TLS) Yes (SSL or TLS) No on port 587

This service is provided by Microsoft Office 365 Exchange Online (O365). To connect to it, a sending system needs to be on a “global-scoped address” (GSA) and have access through host and data center firewalls. Authentication is required using a valid Hawk ID or service account. The From address specified when sending must be authorized for the associated Hawk ID or service account.  i.e. the mailbox email alias or other SMTP address stamped on the mailbox. 
Note: Some user accounts may have owner/send as rights for the service account and thus be authorized, but we do not recommend and strongly discourage programming personal HawkID and password information in applications. on port 587

This service is an on-campus gateway to It is provided to allow “local-scoped address” (LSA) systems (or firewalled systems in the ITF and LC data centers) to send via O365. It has the same requirements as on port 25

This service is available for sending without authenticated-SMTP. It is available for use by systems on GSA or LSA. The To address specified must be in the list of valid University of Iowa O365 domain names.

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Last updated: 
May 5, 2017