It is planed to reduce the number of "spam" e-mail messages out going from METU with the usage of a spam filter. Within the scope of such an action, when an e-mail message gets stuck in the spam filter, an alert message will be relayed to the user via the e-mail program being used.

Below is a list of alert messages depending on the e-mail software being used.

Horde Alert Message

• An error occurred while sending: Failed to send data [SMTP: Invalid response code received from server (code: 550, response: 5.7.1 Blocked by SpamAssassin)]

Squirrelmail Alert Message

• ERROR: Action not taken: no mail box
  Server replied: 550 5.7.1 Blocked by SpamAssassin

IMAP/POP3 Client Alert Message

• An error occured while sending mail. The mail server responded: 5.7.1 Blocked by SpamAssassin . Please check the message and try again.