Information Systems & Services (ISS) - Rejected Mail
Information Systems & Services (ISS)
Spam - Rejected Mail
We use postfix to block a large number of spam mails to DCU every day. Ocassionaly genuine mail will get blocked. There can be a number of reasons for this but in general you should contact your own mail administrator/provider.
If you send a mail which gets rejected you will receive a reject message. This explains why your mail was blocked. This information will be needed by your mail administrator to determine what the problem is.
Sample Reject Messages
Dangerous Attachments - more info
Your message contained an attachment which is considered potentially dangerous. Please see http://www.DCU.ie/csd/spam/attachments.shtml. This contains instructions on how to send these file types to DCU mail accounts.
DNS Blacklists blocking - more info
Service unavailable; Client host [999.888.777.666] blocked using bl.spamcop.net; Blocked - see http://www.spamcop.net/bl.shtml?999.888.777.666 (in reply to RCPT TO command)
Helo Command Rejected - more info
RCPT TO: <Joe.Bloggs@DCU.ie> Received 504 <MachineName>: Helo command rejected: need fully-qualified hostname
Don't understand why your mail to DCU is being rejected ?
If you have found none of the above helpful we can examine your reject
You will need to go to this page and enter the reject message in the form provided.