colleen User Group
A project of CUG
Why are messages to one of your users rejected?
There are five possibilities, why a message could be rejected:
- The message contains a program file (exe, com, bat, ...)
- Your message is classified as SPAM by our system
- The sending server is listed in a RBL (relay blacklist)
- The sending domain or IP address is locally blacklisted
- The recipient's mailbox is over quota
The message contains a program file (exe, com, bat, ...)
Due to security policies we don't accept e-mails with executable attachments.
The following extensions are blocked:
Workaround: Include the program in a zip-file.
Your message is classified as SPAM by our system
We use Spamassassin for spam prevention. Any messages with a spam-score higher than 10 will be rejected. Normally no regular message will reach that spam-score of 10 points.
Workaround: Send no HTML-mails, don't use multiple exclamation marks (!!!!) in subject and body, don't use "spammer-words" like "Viagra".
The sending server is listed in a RBL (relay blacklist)
Some of our users use RBLs (relay blacklists) for blocking mails from known spam sources.
Workaround: Check, if your current IP-address is listed in a RBL (use the interface at http://openrbl.org/dnsbl and enter your IP there).
The sending domain or IP address is locally blacklisted
Some of our users use their own blacklists for blocking mails from
known spam servers/domains. Unfortunately "innocent" senders' mails
may fall victim to this policy.
Workaround: Try to send your email via a different mail server or
with a different domain in your From:. If that's not possible contact
postmaster@$domain in order to arrange different means of delivery.
The recipient's mailbox is over quota
If the recipient's mailbox is full, new messages will bounce (error message: [temporarily over quota]).
Workaround: Try to send the message again later or contact the recipient.
For further questions please refer to email@example.com
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