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Contact us

Mailing Address: LLC
23009 NE 188th St
Holt, MO 64048-8763


Toll Free 866-271-ETRN (3876)
or 815-986-7309


816-264-ETRN (3876)

Facebook: ETRN
Twitter: @ETRNcom

You can leave a message using the contact form below.

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.