Qmail Interview Questions with Answers
Question: 1. Which Qmail Process Use “concurrecylocal” Control File ?
Answer:
mail-ship
Question: 2. I Am Running Qmail-scanner With Spamassassin And Clamav. When I Run The Qmail-scanner Test Script Or When I View My Logs, I See The Following Error: Qmail-inject: Fatal: Qq Temporary Problem Bad Error. Qmail-inject Died?
Answer:
This may be constant by means of elevating the “softlimit” placing inside the /var/qmail/supervise/qmail-smtpd record.
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Question 3. I’m Getting The Following Error Concerning Vpopmail: Configure: Error: No Vpopmail Etc/lib_deps File. Upgrade To Vpopmail-four.9.8 Or Above…. What’s Wrong?
Answer:
This blunders is generally induced when installing Vpopmail over a preceding Vpopmail set up. Try absolutely getting rid of the /home/vpopmail listing and then deploy a clean copy of Vpopmail. That must clean it up.
Question: 4. Can I Have Spamassassin Tag Suspected Spam With A Custom Subject Line?
Answer:
Yes. Edit the /var/qmail/bin/qmail-scanner-queue.Pl report and discover the following line:
my $spamc_subject=`:SPAM:`;
Now kind a custom junk mail difficulty. This issue line may be brought to any mails that Spamassassin tags as suspected spam. Here’s an example:
my $spamc_subject=`This is Spam Mail`
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Question five. When Compiling Qmail, I Get The Following Error: Qmail-remote.C:36: Openssl/ssl.H: No Such File Or Directory What’ S Wrong There?
Answer:
openssl and libssl-dev applications are required for qmail compiling. Check these packages are hooked up or no
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Question 6. What Is Maildir ?
Answer:
Maildir is a mailbox layout created by using Dan Bernstein to address the shortcomings of the mbox layout. A maildir mailbox is a directory containing three subdirectories, new, cur, and tmp. Each message in a maildir mailbox is in a separate report in one of the subdirectories, relying upon its reputation: new is for unread messages, cur is for messages which have been visible, and tmp is for messages in the manner of being introduced.
Question: 7. When I Test Qmail-scanner, I Get An Error That States: “cannot Do Suid”. What’s Wrong?
Answer:
Your server isn’t set up to permit for setuid execution of scripts. The simplest way to repair that is to install the “perl-suidperl” package deal. If you are running Redhat, you can down load the modern day RPM of perl-suidperl.
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Question 8. How Can I Disable Qmail From Conducting Reverse Dns Lookups On Smtp Connections?
Answer:
This can be achieved through adding a “-H” flag to the tcpserver name inside the qmail-smtpd supervise script.
/usr/local/bin/tcpserver -v -R -H -l “$LOCAL” -x /etc/tcp.Smtp.Cdb -c “$MAXSMTPD”
Question: nine. What Is Procmail ?
Answer:
procmail is a popular Message Delivery Agent (MDA). The feature of an MDA is to just accept a message from the MTA for a specific consumer or mailbox, and supply the message according to the person’s dreams. Procmail may be used to “clear out” messages by the content material of diverse header fields or the body of the message.
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Question 10. Which Groups And Users Are Required To Start Qmail Server ?
Answer:
Groups :- nofiles
qmail
Users :- qmaild
alias
qmaill
qmailp
qmailq
qmailr
qmails
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Question 11. Which Antivirus You Have Used With Qmail?
Answer:
ClamAV antivirus
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Question 12. Where Clam Av Quarantines The E-mails?
Answer:
Clam AV quarantines the e-mails in /var/spool/qmailscan/quarantine
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Question 13. Which Web Based Interface You Have Used To Manage Vpopmail?
Answer:
Vqadmin
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Question 14. What Is Maildrop?
Answer:
Maildrop is a mail filtering agent which may be used to clear out messages as they come on the server.
Question: 15. What Is Qmailadmin?
Answer:
Qmailadmin is going to provide us with a pleasing internet based interface for administering mail debts as soon as they’re setup via Vpopmail (or Vqadmin). From Qmailadmin we are able to create mailboxes, aliases, forwards, mail robots, mailing lists.
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Question 16. How To Check, Qmail Server Is Up Or Down ?
Answer:
We can use qmailctl command to test the popularity of qmail server.
# qmailctl stat
/service/qmail-ship: up (pid 30303) 187 seconds
/carrier/qmail-ship/log: up (pid 30304) 187 seconds
/service/qmail-smtpd: up (pid 30305) 187 seconds
/service/qmail-smtpd/log: up (pid 30308) 187 seconds
messages in queue: 0
messages in queue however not but preprocessed: zero
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Question 17. What Is Qmail ?
Answer:
qmail is a mail switch agent that runs on Unix/Linux. It turned into written, beginning December 1995, via Daniel J. Bernstein as a greater relaxed alternative for the popular Sendmail application. Qmail’s source code is launched to the public domain, making qmail loose software.
Unix/Linux Interview Questions
Question 18. What Is The Use Of Vadddomain Command?
Answer:
Vadddomain command is used to provides a brand new area to the qmail server.
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Question 19. What Is “vchkpw”?
Answer:
vchkpw is the authentication mechanism utilized by qmail to test passwords required for downloading mail, and in the case of SMTP_AUTH, sending mail.
Question: 20. What Is Vpopmail?
Answer:
vpopmail is a unfastened GPL software program package deal, to offer an clean way to manage digital e mail domains and non /and so forth/passwd electronic mail debts in your qmail server.
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Question 21. Why Vpopmail?
Answer:
vpopmail provides a very good set of management gear and a fairly nicely designed shape which saves you implementing your personal. Vpopmail has additionally been round for a long term and enjoys aid from a whole lot of other software packages related to mail which makes integration pretty simple.
Question: 22. What Is Courier-imap ?
Answer:
A server that offers IMAP get entry to to Maildir mailboxes. This IMAP server does NOT handle traditional mailbox documents (/var/spool/mail, and derivatives), it turned into written for the particular reason of providing IMAP get admission to to Maildirs.
Question: 23. Can Vpopmail Integrated With Mysql Database?
Answer:
Yes.
Sendmail Interview Questions
Question 24. Tell Me The Location Of Vpopmail Binaries?
Answer:
/domestic/vpopmail/bin
Linux Interview Questions
Question 25. What Is The Location Of Qmail Control Files ?
Answer:
/var/qmail/control
Question: 26. Tell Me The Name Of Five Important Qmail Daemons?
Answer:
qmail-queue
qmail-send
qmail-easy
qmail-lspawn
qmail-rspawn
qmail-nearby
qmail-far flung
Question: 27. Which Mailing List You Have Configured With Qmail?
Answer:
EZmlm
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Question 28. Explain The Working Of Qmail?
Answer:
For mail getting back from far flung systems, tcpserver runs as a daemon listening for incoming connections on the SMTP port. Each time a connection arrives, it runs qmail-smtpd, which receives a message thru SMTP and calls qmail-queue to queue the message. Regardless of in which the message originates, qmail-queue writes the message to a temporary file inside the queue/todo directory, setting a new Received: line on the pinnacle, and also saves the envelope sender and recipient addresses to files. Then it notifies qmail-ship via writing a byte to a “cause” socket record. Qmail-ship takes the message out of queue/todo, and analyzes each recipient address to look if it’s neighborhood, faraway, or virtual. For neighborhood addresses, it notifies qmail-lspawn to run qmail-neighborhood to do the local deliveries. For each remote cope with, qmail-ship notifies qmail-rspawn to run qmail-remote to do the remote deliveries. For virtual addresses, qmail-send rewrites every digital deal with as a modified neighborhood cope with, the use of the information from the virtualdomains files.
Question: 29. What Is The Use Of “queuelifetime” Qmail Control File?
Answer:
This qmail manage record is utilized by qmail-send daemon. In this document we define how long to keep looking to supply a message. The default value is 604800 seconds (every week).
Question: 30. What Is The Use Of “timeoutconnect” Qmail Control File?
Answer:
This qmail manage file is used by qmail-far flung daemon. In this record we define how long to watch for a far off server to accept the initial connection to ship mail. The default cost is 60 seconds.
Question: 31. What Is The Use Of “virtualdomains” Qmail Control File?
Answer:
The listing of digital users and domain names for which this device receives mail. The default fee on this report is none.
Question: 32. Have You Installed Autoresponder & What Is The Use Of Autoresponder?
Answer:
Yes, that is a simple application to mechanically respond to emails.
Question: 33. What Is “ucspi-tcp”?
Answer:
A bundle for servers that respond to incoming TCP connections, as an opportunity to the vintage inetd daemon. It was non-compulsory, however its tcpserver is now the best supported way to run qmail’s SMTP daemon.
SNMP Interview Questions
Question 34. What Is “checkpassword”?
Answer:
If you’re using qmail’s integrated POP3 server, you need Dan’s checkpassword software, which validates user logins as properly. Even if you’re installing an opportunity checkpassword, it is satisfactory to have Dan’s checkpassword set up for trying out.
Question: 35. What Is The Use Of “jump From” Qmail Control File?
Answer:
This qmail manage record is utilized by qmail-send daemon. This file contains the mailbox of the go back cope with to put in leap messages.
Question: 36. What Is Use Of “concurrencylocal” Qmail Control File?
Answer:
This qmail control document is utilized by qmail-ship daemon. This file carries the maximum variety of simultaneous local deliveries. The default value is 10.
Postfix Interview Questions
Question 37. Which Mailbox Format Is Used By Qmail?
Answer:
Qmail helps mailbox formats: the traditional mbox and Dan’s more moderen Maildir.
Question: 38. Explain About Qmail Control File “locals”?
Answer:
Domain names to be delivered domestically, one in keeping with line. Mail to any domain listed in locals is delivered by treating the mailbox part as a local cope with. This commonly consists of the name of the host and the call of the domain used for consumer mailboxes, which includes test.Com and mail.Take a look at.Com.
Question: 39. Explain About Qmail Control File “rcpthosts”?
Answer:
Domains for which this host ought to take delivery of mail through SMTP. This commonly consists of all 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 no longer exist, qmail accepts and can provide mail for any domain, a severe misconfiguration referred to as an “open relay,” as a way to be hijacked via spammers. Be positive your rcpthosts file exists earlier than starting qmail. If you haven’t described any virtual domain names, just copy locals to rcpthosts.
Question: forty. Explain About Qmail Control File “badmailfrom”?
Answer:
This qmail manage report is utilized by qmail-smtpd. Envelope addresses no longer allowed to ship mail. If the envelope from cope with on an incoming message matches an entry in badmailfrom, the SMTP daemon will reject every recipient address. Entries may be either e-mail addresses, or @domain to reject each cope with in a domain. This is a primitive form of junk mail filtering.
Unix/Linux Interview Questions
Question forty one. What Is Use Of “concurrencyremotel” Qmail Control File?
Answer:
This qmail control document is used by qmail-ship daemon. This document contains the maximum number of simultaneous far off deliveries. The default price is 20.
Question: 42. Explain Qmail Control File “me”?
Answer:
The name of this host, e.G., mail.Test.Com. This provides the default to apply for many other configuration files.
Zimbra Interview Questions
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