Top 100+ Mail Server Interview Questions And Answers
Question 1. What Is A Postfix Mail Server?
Answer :
A mail server is an application that gets incoming email from local users and forwards outgoing email for delivery. A computer committed to running such programs is called a Mail Server.
Question 2. What Is The Location Of Postfix Mail Server Queue?
Answer :
By default, the Postfix mail queues are positioned inside the /var/spool/postfix directory.
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Question three. What Is Postfix And Default Port Used For Postfix?
Answer :
Postfix is an open supply MTA (Mail Transfer agent) that is used to route & supply emails. Default port for postfix is 25.
Question 4. What Is Smtp And Its Default Port?
Answer :
SMTP is part of the utility layer. SMTP movements your email throughout the networks. SMTP via default uses TCP port no 25. It additionally makes use of port no 587 for connections secured with the aid of SSL, known as SMTPS.
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Question 5. What Is Dovecot?
Answer :
Dovecot is an open-supply IMAP and POP3 server for Linux/UNIX-like structures, written usually with safety in thoughts.
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Question 6. What Is Mta And Its Role In Mailing System?
Answer :
A message transfer agent (MTA) is a software utility used inside an Internet message handling system. It is answerable for transferring and routing an e-mail messages from the sender's laptop to the recipient's computer.
Question 7. What Is Mda?
Answer :
MDA stands for Mail Delivery Agent. MDA is a Program that handles final transport of messages for a device’s neighborhood recipients.
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Question eight. What Is Mua?
Answer :
MUA stands for Mail User Agent. MUA is an Email client software program used to compose, ship, and get hold of electronic mail messages. It sends messages thru an MTA. Retrieves messages from a mail save both without delay or thru a POP/ IMAP server. Examples Outlook and Thunderbird.
Question nine grep mail_version
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Question 10. Tell Me About Latest Version Of Postfix On Which U Have Worked?
Answer :
postfix 2.6
Question 11. What Is The Use Of Postmaster Account In Mail Server?
Answer :
An electronic mail administrator is generally called a postmaster.
Postmaster Mail Server helps you to ship and get hold of e mail from any computing device on LAN. There is not any need for a modem with each computer.
It lets in you to allot character electronic mail ids like character@company.Com to every govt.
Postmaster supports multiple domain names. You can send/acquire emails from all of the domains that your business enterprise uses.
Postmaster works as a low fee SMTP Gateway.
You can set distinct schedules for distinct days of the week for computerized dial-up and mail switch. Thus you can take a look at mail greater regularly on busy days, mechanically.
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Question 12. What Are The Configuration Files Of Postfix Server?
Answer :
There are major Configuration documents of postfix:
/etc/postfix/principal.Cf
/and many others/postfix/master.Cf
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Question thirteen. How To Check The Mail’s Queue In Postfix?
Answer :
To display the list of queued mails:
# postqueue -p
To Save the output of above command:
# postqueue -p > /mnt/queue-backup.Txt
Tell Postfix to technique the Queue now:
# postqueue -f
Question 14. How To Delete Mails From The Queue In Postfix? Or How Can I Clear Postfix Mail Server Queue?
Answer :
# postsuper -d ALL
Question 15. How You Will Reload The Postfix Queue?
Answer :
# postsuper -r ALL
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Question 16. How To Check Postfix Configuration From The Command Line?
Answer :
psotconf -n
Question 17. Which Command Is Used To See Live Mail Logs In Postfix?
Answer :
# tail -f /var/log/maillog OR
tailf /var/log/maillog
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Question 18. How To Send A Test Mail From Command Line?
Answer :
# echo “Test mail from postfix” forget about” user@agency.Com
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Question 19. What Is An Open Mail Relay?
Answer :
An open mail relay is an SMTP server configured in this kind of manner that it lets in each person at the Internet to send e mail via it, not just mail destined to or originating from recognised customers.This used to be the default configuration in lots of mail servers. It became the way the Internet turned into first of all installation, but open mail relays have grow to be unpopular because of their exploitation by means of spammers and worms.
Question 20. Which Command Is Used To Find Out That Postfix Is Complied With Mysql Or Not?
Answer :
# postconf -m
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Question 21. What Is Spamassassin?
Answer :
SpamAssassin is a mail filter out to identify spam. It is an sensible electronic mail clear out which makes use of a numerous range of assessments to pick out unsolicited bulk email, greater normally called Spam. These assessments are applied to e-mail headers and content material to classify electronic mail the use of advanced statistical strategies.
Question 22. If You Have 40000 Mail In Queue Of Your Mail Server How Will You Troubleshoot Step By Step?
Answer :
Depends on what mails are there whether or not critical mail or no longer important (delete no longer important mails and for essential e mail re-queue postfix to ship mail again).
Question 23. You Mail Server Is Working Properly Still Your Users Are Not Getting Mail How Will You Troubleshoot?
Answer :
Check log (eg /var/log/maillog) and try and locate the error
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Question 24. If Reverse Dns Entry For Your Mail Server Is Wrong Which Error You Will Get And How It Will Effect Your Mail Server?
Answer :
Server refused to speak to me: 550 Reverse DNS lookup failed for host XX.XXX. (port 25)
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Question 25. Describe Below Mentioned Postfix Support Commands?
Answer :
The postfix: command controls the operation of the mail system. It is the interface for starting, stopping, and restarting the mail device. This command is reserved to the terrific-user.
The postalias: command maintains Postfix aliases kind databases. This is this system that does the work for the newaliases command.
The postcat: command presentations the contents of Postfix queue files. This is a confined, preliminary application. This program is probably to be outmoded by means of some thing greater effective that also can edit Postfix queue files.
The postconf: command shows or updates Postfix major.Cf parameters and displays machine dependent facts approximately the supported report locking techniques, and the supported kinds of lookup tables.
The postdrop: command is the mail posting software this is run by way of the Postfix sendmail command in order to deposit mail into the maildrop queue listing.
The postkick: command makes some Postfix inner communication channels available for use in, for example, shell scripts.
The postlock: command offers Postfix-well matched mailbox locking to be used in, as an example, shell scripts.
The postlog: command offers Postfix-well suited logging for shell scripts.
The postmap: command continues Postfix lookup tables inclusive of canonical, digital and others. It is a cousin of the UNIX makemap command.
The postmulti: command repeats the "postfix start" and so on. Command for each Postfix example, and supports creation, deletion etc. Of Postfix instances. For a tutorial, see MULTI_INSTANCE_README.
The postqueue: command is the privileged command this is run via Postfix sendmail and mailq if you want to flush or listing the mail queue.
The postsuper: command maintains the Postfix queue. It eliminates vintage transient files, and moves queue documents into the proper listing after a exchange inside the hashing intensity of queue directories. This command is run at mail device startup time and whilst Postfix is restarted.
Question 26. If Your Mail Server Is Working Properly But When You Are Trying To Send Mail For Hotmail It Is Showing Error Relay Access Denied How Will You Troubleshoot?
Answer :
check for the proper relay or postifx essential.Cf report for the relay address.
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Question 27. What Is Canonical Table?
Answer :
A canonical item way an object with a unmarried reference pointed to it, with out a copies retaining the same state possible. The pastime of changing more than one copies of an object with just a few objects is frequently referred to as canonicalizing items.
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