E-Mail Spooling Service - Sending an ETRN query with Exchange >= 2007

Starting with Exchange 2007, Microsoft appears to have dropped the support for sending an ETRN query from Exchange.

Given this, customers needing to send ETRN queries have had to use seperate utilities for this purpose.  One of those utilities is "Borisware ETRN Mail Kicker".  This utility can be found here: http://www.boris.org.uk/borisware/etrn.html


An example command line using this utility may be:

etrn /address=etrnhost.etrn.com /port=SMTP /ehlo=mail.domain.tld /etrn="domain.tld"



  • etrnhost.etrn.com = the ETRN host assigned to your account.
  • domain.tld = the primary domain of your account.

We Answer Your Questions: FAQ

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

A: The ETRN.com e-mail servers do not limit the size of individual e-mail attachments. The ETRN.com 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.