Qmail Interview Questions & Answers part 5

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Q: – What is “checkpassword”?

If you're using qmail's built-in POP3 server, you want Dan's checkpassword program, which validates user logins as well. Even if you're installing an alternative checkpassword, it's nice to have Dan's checkpassword installed for testing.

Q: – What is the use of “bouncefrom” qmail control file?

This qmail control file is used by qmail-send daemon. This file contains the mailbox of the return address to put in bounce messages.

Q: – What is use of “concurrencylocal” qmail control file?

This qmail control file is used by qmail-send daemon. This file contains the maximum number of simultaneous local deliveries. The default value is 10.

Q: – Which Mailbox Format is used by Qmail?

Qmail supports two mailbox formats: the traditional mbox and Dan's newer Maildir.

: – Explain about qmail control file “locals”?

Domain names to be delivered locally, one per line. Mail to any domain listed in locals is delivered by treating the mailbox part as a local address. This usually contains the name of the host and the name of the domain used for user mailboxes, such as test.com and mail.test.com.

Q: – Explain about qmail control file “rcpthosts”?

Domains for which this host should accept mail via SMTP. This generally contains all of the domains in locals, as well as any virtual domains and any domains for which this host is a backup mail server. If rcpthosts does not exist, qmail accepts and delivers mail for any domain, a severe misconfiguration known as an "open relay," which will be hijacked by spammers. Be sure your rcpthosts file exists before starting qmail. If you haven't defined any virtual domains, just copy locals to rcpthosts.

Q: – Explain about qmail control file “badmailfrom”?

This qmail control file is used by qmail-smtpd. Envelope addresses not allowed to send mail. If the envelope from address on an incoming message matches an entry in badmailfrom, the SMTP daemon will reject every recipient address. Entries may be either email addresses, or @domain to reject every address in a domain. This is a primitive form of spam filtering.

Q: – What is use of “concurrencyremotel” qmail control file?

This qmail control file is used by qmail-send daemon. This file contains the maximum number of simultaneous remote deliveries. The default value is 20.

Q: – Explain qmail control file “me”?

The name of this host, e.g., mail.test.com. This provides the default to use for many other configuration files.

Submitted By:-Payal Chauhan            Email-ID: – payalchauhan@ibibo.com

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