Skip to main content

Vmail: Frequently Asked Questions

Click here to learn about the Vanderbilt E-Mail Address Policy.

Users can log into Outlook by going to using either a Public or Private computer. Your choice depends on where you are.

Check public computer (blue highlight) if you are using a computer which will be used by more than one person. Examples of public computers include computers in a public place, computers shared in an office, or kiosks . For security reasons, selecting the public computer option will log out of email after 30 minutes of inactivity and e-mail addresses will not be cached when sending messages.

Check private computer (green highlight) if you are the only person who uses the computer. The private computer option will log out of email after 8 hours inactivity. This option will cache email addresses when sending messages.

E-mails may be sent to a maximum of 250 recipients per email. It can be adjusted to meet a business need if approved. VUIT encourages the use of Distribution Lists to help main this recipient count.

If you use an Outlook Contact List instead of a Distribution List, each recipient in the Contact List counts as a single recipient.

Each mailbox can send emails to a maximum of 10,000 recipients per day.

The Collaboration team recommends the sharing of files via links to OneDrive or Box shares, instead of email attachments,

The message size limit for e-mails in Vanderbilt is 25 MB. This size limit includes all attachments. If you need to send a large attachment, choose one of the following options:

  1. Compress the file using Windows Explorer, WinZip, or 7Zip.
  2. Attachment Count: Total number of attachments may not exceed 256.
  3. No single attachment can exceed 20 MB.
  4. Archived attachments in ZIP, TAR, SIT, or other compressed format may not exceed 20 MB.
  5. Total number of files within an archived attachment may exceed 256.
  6. The maximum folder depth within an archived attachment may exceed 20.
  7. Split the file into two or more smaller files and send in separate e-mails.
  8. Contact Partner Support for assistance in transferring large files.

Note: Other message size restrictions may be applied by your recipient’s domain and will take precedence over our limits.

Yes. To prevent the spread of viruses, protect campus productivity, & resources, Vanderbilt Information Technology (VUIT), in consultation with IT School Leaders and the Senior School Leaders IT Committees, has elected to prevent certain IN-BOUND (not internal email) attachments from passing through the Vanderbilt mail servers beginning November 15, 2004.

VUIT annually reviews extensions to be blocked with IT School Leaders and the Senior School Leaders IT Committees. Potentially dangerous attachments are identified by their three letter filename extension. All attachment extensions will be assessed and the selected extensions will be rejected, regardless of the Operating System of the originating computer."

1. Open the Address Book and look up the distribution group.

2. Right-click the distribution list and select Properties.

3. Select Modify Members on the lower right.

4. Add or remove users. Click OK to save and exit.

Note: All changes made take up to 24 hours to replicate to local copies of the address book in Outlook. Changes to replicate OWA’s address book within 15 minutes.

1. Log into OWA: .

2. Go to “Options” and click on “See All Options”.

3. Click “Groups” on the left.

4. You will see two columns: Public Groups I Belong To Public Groups I Own .

5. Find the distribution list in “Public Groups I Own” and double-click it.

6. Add/Remove members or owners under the “Ownership” and “Membership headings.

7. After the desired changes have been made, click the Save button.

NOTE: All changes take up to 24 hours to replicate to local copies of the address book in Outlook. Changes replicate to OWA's address book within 15 minutes.


Spam is commonly defined as th e sending of unsolicited bulk e mail - that is, email that was not asked for (unsolicited) and received by multiple recipients (bulk).

VUIT utilizes Microsoft Exchange Online Protection (EOP) to filter spam for the university . All VMail and VUGmail users are enrolled in the service by default. Email sent to other external email services such as Yahoo! or Hotmail will not be filtered, though you may review these messages on campus.

Click here to learn more about Exchange Online Protection.

Follow this link to access emails quarantined by E xchange Online Protection (E OP ) . Enter your VUnetID and eP assword .

If you are on a MAC and received an error regarding certificates, click here and follow the steps.

Click here for information on managing your quarantined emails.

If you receive a spam email, you can send an email to Microsoft by forwarding the email as an attachment to: . Additionally, Outlook users may download a plugin from Microsoft, allowing the ability to report email as spam from within the message itself.

Click here to learn how to manage Junk email settings.

Safe senders are emails you do not want quarantined by Outlook . Emails are classified into two classes. Direct and Campaign.

Direct emails are messages sent directly from one person to another. This includes distribution or contact lists. The person listed in the “From” line is the one who sent the message.

Campaign emails are sent to large groups of people from one person. Third party applications such as Constant Contact, My Emma, etc … are examples of such applications. The person in the “From” line on these emails is not the person who sent the message in most cases.

Click here to learn how to mark a Safe Sender in Outlook.

Click here to learn how to mark a Safe Sender in OWA.

To change your primary email address, please submit a request ticket .

  • New Outlook Web Access – new look, better browsing capability, archiving, emojis, etc.
  • Updated Calendar – email reminders for events, improved search, birthday calendars, etc.
  • More storage – 100GB mailbox storage for each user
  • Better integration with other Office 365 services, like OneDrive and SharePoint
  • Improvements to document collaboration
  • More comprehensive spam detection
  • Additional out of office options

You are able to add additional email accounts in the Outlook app, such as Yahoo, Gmail, etc.

To access OWA after your mailbox is in the cloud, you will go to  Once there, you will sign in with your Vanderbilt credentials to access your inbox.

To manage your groups, please submit a request to ask for the "Horizon Client". 

After your mailbox migrates, you will need to submit a Help Desk request to have your PST files moved.

Users of IMAP or POP will need to update settings after migration. The configuration settings are included below.

If you need further assistance, submit a request to our help desk.

If your out-of-office auto-reply was on before or during your migration, it may not turn off at the time you scheduled. Please manually turn your auto-replies off. If you are still in need of assistance, feel free to contact the help desk.

Microsoft recently changed the format of quarantined messages for Shared Exchange Mailboxes which does not allow for the message to be released. If you have a message that you need to retrieve, please submit a support request for assistance.

Yes, you can add other email accounts to your Outlook client. Directions for VU users are available here. If you require additional assistance, please submit a support request. For VUMC assistance, please contact VUMC support.

To find your primary email address for your Vanderbilt University account, please follow these steps:

  1. Go to
  2. Sign in with your SSO credentials (VUnetID and e-password)
  3. Click View My Email Addresses
  4. Your primary email address will be shown in bold, blue text.