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Problems accessing Mailguard? Please check your URL ...

Have you been experiencing problems accessing our Mailguard web site since Friday (12/11/2015)? If so, please check the URL that your accessing.

For approximately two years now the official Mailguard URL has been During that time, the old URL ( has simply been a redirect to the new URL. As of Friday, December 11, 2015, we have retired the old URL. If you have bookmarked the old site, please update your bookmarks with the correct URL.

Please note, you can also find the official Mailguard URL in the Quarantine Reminder e-mails that our system sends when you have quarantined items.

We appreciate your business and welcome any feedback. 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.