Animal Health Trust
If you’re reading this page, it’s probably because you’ve tried to send an email to the AHT, and have either had the email rejected or have had a “bounce” email returned to you. This page describes the most common reasons for this to happen, and explains what you what you can do to ensure you email is delivered.
Check you have the correct address
The AHT does not accept emails for invalid recipients, so make sure you’ve spelt the recipients name correctly. Also check to make sure you don’t have any illegal characters in the address. As a general rule of thumb, AHT email addresses are in the format firstname.lastname@example.org.
Check your attachment size
The AHT does not accept emails which are larger than 30Mb (megabytes). If you wish to send files which are larger than this, you must either compress them using a compression utility (e.g Winzip) to reduce the file size, or upload the files to a website and just send the recipient a link to the file.
If your email contains a banned attachment type, it can be blocked in two ways. If it contains a common dangerous attachment (e.g exe, pif or com files), the email will simply be rejected. The AHT system does not permit delivery of these types of files via the email system.
If it contains a file type such as .js or .vbs which is considered potentially dangerous, your email will be quarantined. If this happens, you should send a new email to email@example.com requesting that the email be released to the intended recipient. Please do not just forward the original email to this address, since it will be quarantined again.
If you will be repeatedly sending attachments which are blocked by our system, we recommend you consider uploading the files to a web or ftp site, and just send the recipient a link to the files.
Your address has been blacklisted
The AHT uses the SBL and XBL blacklists that are available at www.spamhaus.org. Note that the AHT has no control over the contents of these blacklists. If you have been incorrectly blacklisted, you can find the procedure for removing your address from both lists at http://www.spamhaus.org/lookup.lasso. For more information, or if you have not been blacklisted by Spamhaus, please contact firstname.lastname@example.org.
Mail server configuration
The AHT mail system will not accept emails from mail servers which have been configured without a fully qualified domain name (FQDN), or that have a FQDN which does not exist in the public DNS hierarchy (see RFC 2505 for more info). If your mail server is not using a valid FQDN, you may wish to speak to your email administrator.