Qmail has several settings that apply to all email messages that it processes, related to the hostname that it uses, SMTP timeouts, and the maximum message size. The steps below explain how to set them and what they mean.
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4. | To change the amount of time that your server will wait for a remote MTA to accept an SMTP connection, fill in the SMTP
connection timeout field. If Default is selected, a timeout of 60 seconds will be used. It may be useful to lower this to prevent your system wasting too much time trying to contact down servers—60 seconds is usually far too long to wait. |
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6. | To stop your MTA from accepting large emails, select the second button in the Maximum message size field and enter the maximum number of bytes that an email can contain in the text box next to it. If Unlimited is chosen, mail of any size will be accepted. Setting a limit can be useful on systems with limited disk space or network bandwidth. |
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8. | When your server accepts a message to an address like [email protected] where 1.2.3.4 is one of the system's local IP addresses, it will convert that address into the hostname specified in the Hostname for email to local IP address field. Even though email is not supposed to be addressed like this, it can sometimes happen and Qmail can deal with it. If Default is selected, the host or domain name from the Local host name field is used instead. |
9. | To change the greeting that Qmail will present to SMTP clients when they connect, choose the second radio button in the SMTP
greeting message field and enter some text into the adjacent text box. This message should start with the system's hostname, and if Default is selected, that is all it will contain. |
10. | Click the Save button to update the Qmail configuration files with the new settings. |
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