Mailguard - How to enable automatic individual user account creation

Mailguard can be configured by the domain administrator to automatically create new users as they receive e-mail.


Domain administrator instructions:

  1. Login to Mailguard as a domain administrator.
  2. Go to Admin (Admin) => Domains.
  3. Under "Domains":
    1. Click on the desired domain and confirm that the line above the menu icons says "Domain Mail Filter Defaults"
    2. Change the Enable user auto-creation? value to Yes.
    3. To save your changes, Click on Update This Domain's Defaults.


Thank you for being a ETRN customer. Please contact us if you have any questions.

We Answer Your Questions: FAQ

Q: What is the maximum e-mail attachment size?

A: The e-mail servers do not limit the size of individual e-mail attachments. The e-mail servers do impose a 400 MB maximum total message size limit. Individual customers can choose a smaller message size limit. We can also customize the handling of "over-sized" e-mails. Please contact us to discuss your specific needs. A couple of important facts:

1. Attachments are typically encoded in what is called Base64[1]. As a result, the actual length of MIME-compliant Base64-encoded binary data is usually about 137% of the original file size.

2. E-mails often contain both plain text and HTML components. This also increases the overall size of the e-mail.