Top 50 Postfix Interview Questions with Answers

Postfix Interview Questions with Answers

1) Which of the following is the correct syntax for postfix’s main configuration file?

a) /etc/postfix/mainconfig.cf
b) /etc/postfix/main.cf
c) /etc/postfix/config.cf
d) /etc/config/postfix.cf

Answer: b) /etc/postfix/main.cf

2) Which of the following applications is responsible for delivering mail in postfix?

a) smtpd
b) postfixd
c) maild
d) sendmail

Answer: a) smtpd

3) Which of the following commands can be used to restart postfix without stopping mail delivery?

a) postfix reload
b) postfix stop
c) postfix start
d) postfix restart

Answer: a) postfix reload

4) Which of the following protocols does postfix support for incoming mail delivery?

a) SMTP
b) POP3
c) IMAP
d) All of the above

Answer: a) SMTP

5) Which of the following tools can be used to view the mail queue in postfix?

a) mailq
b) postqueue
c) both a and b
d) neither a nor b

Answer: c) both a and b

6) Which of the following commands can be used to send a test email in postfix?

a) mail test@test.com
b) echo “test message” | mail -s “test subject” test@test.com
c) posttest -s “test subject” -r test@test.com
d) sendmail test@test.com -s “test subject” -m “test message”

Answer: b) echo “test message” | mail -s “test subject” test@test.com

7) Which of the following configuration options can be used to specify the default mail transport agent in postfix?

a) default_mta
b) default_mailer
c) default_transport
d) default_agent

Answer: c) default_transport

8) Which of the following commands can be used to view the postfix configuration parameters?

a) postconfig
b) postconf
c) postfixconf
d) confpost

Answer: b) postconf

9) Which of the following configuration options can be used to specify the local delivery agent in postfix?

a) local_transport
b) local_mailer
c) local_mta
d) local_agent

Answer: a) local_transport

10) Which of the following configuration options can be used to specify the internet hostname of the postfix server?

a) myhostname
b) hostname
c) servername
d) mailname

Answer: a) myhostname

11) Which of the following configuration options can be used to specify the internet domain name of the postfix server?

a) mydomain
b) domainname
c) serverdomain
d) maildomain

Answer: a) mydomain

12) Which of the following configuration options can be used to specify the maximum number of messages allowed in the mail queue in postfix?

a) max_messages
b) max_queue_size
c) max_mail_q
d) maximal_queue_size

Answer: b) max_queue_size

13) Which of the following configuration options can be used to specify the maximum number of messages sent per minute by one client in postfix?

a) max_messages_per_minute
b) max_client_message_rate
c) max_rate_per_client
d) maximal_client_message_rate

Answer: b) max_client_message_rate

14) Which of the following configuration options can be used to specify the maximum size of a single message that can be delivered by postfix?

a) max_message_size
b) max_mail_size
c) maximal_message_size
d) maximal_mail_size

Answer: c) maximal_message_size

15) Which of the following configuration options can be used to specify the SMTP greeting message in postfix?

a) smtp_greeting_message
b) smtpd_banner
c) smtp_banner
d) smtpd_greeting_message

Answer: b) smtpd_banner

16) Which of the following configuration options can be used to reject messages from certain domains in postfix?

a) reject_domains
b) blacklist_domains
c) deny_domains
d) smtpd_sender_restrictions

Answer: d) smtpd_sender_restrictions

17) Which of the following configuration options can be used to reject messages from certain IP addresses in postfix?

a) smtpd_recipient_restrictions
b) smtpd_client_restrictions
c) deny_ip
d) reject_ip

Answer: b) smtpd_client_restrictions

18) Which of the following configuration options can be used to reject messages with empty sender addresses in postfix?

a) smtpd_null_sender_restrictions
b) empty_sender_restrictions
c) reject_empty_senders
d) reject_null_senders

Answer: d) reject_null_senders

19) Which of the following configuration options can be used to specify the hostname of the relay server in postfix?

a) relay_hostname
b) relay_servername
c) relay_host
d) relay_server

Answer: c) relay_host

20) Which of the following configuration options can be used to enable TLS encryption in postfix?

a) enable_tls
b) tls_enabled
c) smtpd_tls_enable
d) tls_smtpd

Answer: c) smtpd_tls_enable

21) Which of the following configuration options can be used to specify the SSL certificate file in postfix for server authentication?

a) smtpd_tls_cert_file
b) smtpd_ssl_cert_file
c) tls_cert_file
d) ssl_cert_file

Answer: a) smtpd_tls_cert_file

22) Which of the following configuration options can be used to specify the SSL private key file in postfix for server authentication?

a) smtpd_tls_key_file
b) smtpd_ssl_key_file
c) tls_key_file
d) ssl_key_file

Answer: a) smtpd_tls_key_file

23) Which of the following configuration options can be used to specify the SSL certificate file in postfix for client authentication?

a) smtpd_tls_CAfile
b) smtpd_ssl_CAfile
c) tls_CAfile
d) ssl_CAfile

Answer: a) smtpd_tls_CAfile

24) Which of the following configuration options can be used to specify the SSL protocols supported by postfix?

a) tls_protocols
b) smtpd_tls_protocols
c) ssl_protocols
d) postfix_tls_protocols

Answer: b) smtpd_tls_protocols

25) Which of the following configuration options can be used to specify the SSL ciphers used by postfix?

a) smtpd_tls_ciphers
b) smtpd_ssl_ciphers
c) tls_ciphers
d) ssl_ciphers

Answer: a) smtpd_tls_ciphers

26) Which of the following configuration options can be used to block all outbound SMTP traffic except for authorized senders in postfix?

a) smtpd_sender_restrictions
b) smtpd_recipient_restrictions
c) smtpd_client_restrictions
d) smtpd_relay_restrictions

Answer: d) smtpd_relay_restrictions

27) Which of the following configuration options can be used to specify the email address for bounces in postfix?

a) bounce_address
b) postmaster_address
c) error_address
d) return_address

Answer: b) postmaster_address

28) Which of the following configuration options can be used to specify the timeout for message delivery in postfix?

a) timeout
b) delivery_timeout
c) message_delivery_timeout
d) smtp_timeout

Answer: d) smtp_timeout

29) Which of the following configuration options can be used to specify the maximum size of a single email attachment in postfix?

a) message_size_limit
b) mail_size_limit
c) attachment_size_limit
d) maximal_attachment_size

Answer: b) mail_size_limit

30) Which of the following configuration options can be used to reject messages from blacklisted senders in postfix?

a) smtpd_helo_restrictions
b) smtpd_sender_restrictions
c) smtpd_recipient_restrictions
d) smtpd_client_restrictions

Answer: b) smtpd_sender_restrictions

31) Which of the following configuration options can be used to specify the maximum number of simultaneous connections to the postfix server?

a) max_connections
b) smtpd_client_connection_limit
c) connection_limit
d) maximal_client_connections

Answer: b) smtpd_client_connection_limit

32) Which of the following configuration options can be used to specify the maximum number of messages sent per second by one client in postfix?

a) max_messages_per_second
b) max_client_message_rate
c) max_rate_per_client
d) maximal_client_message_rate

Answer: a) max_messages_per_second

33) Which of the following configuration options can be used to specify the maximum number of connections from one IP address in postfix?

a) max_connections_per_ip
b) smtpd_client_connection_count_limit
c) connection_count_limit
d) maximal_client_connections_per_ip

Answer: b) smtpd_client_connection_count_limit

34) Which of the following configuration options can be used to specify the maximum number of recipients per message in postfix?

a) recipient_limit
b) max_recipients
c) mail_recipient_limit
d) maximal_recipient_count

Answer: c) mail_recipient_limit

35) Which of the following configuration options can be used to specify the transport map for postfix?

a) transport_map
b) smtp_transport_map
c) mail_transport_map
d) postfix_transport_map

Answer: c) mail_transport_map

36) Which of the following configuration options can be used to specify the relay map for postfix?

a) relay_map
b) smtp_relay_map
c) mail_relay_map
d) postfix_relay_map

Answer: b) smtp_relay_map

37) Which of the following configuration options can be used to specify the delivery map for postfix?

a) delivery_map
b) smtp_delivery_map
c) mail_delivery_map
d) postfix_delivery_map

Answer: c) mail_delivery_map

38) Which of the following configuration options can be used to specify the destination for undeliverable mail in postfix?

a) bounce_destination
b) postmaster_destination
c) error_destination
d) undeliverable_destination

Answer: b) postmaster_destination

39) Which of the following configuration options can be used to specify the relay host authorization map for postfix?

a) relayhost_auth_map
b) smtp_sasl_auth_cache_name
c) relayhost_sasl_auth_cache_name
d) smtp_sasl_password_maps

Answer: d) smtp_sasl_password_maps

40) Which of the following configuration options can be used to specify the SASL authentication method for postfix?

a) smtpd_sasl_auth_enable
b) smtp_sasl_auth_enable
c) sasl_auth_enable
d) postfix_sasl_auth_enable

Answer: b) smtp_sasl_auth_enable

41) Which of the following configuration options can be used to specify the SASL security options for postfix?

a) smtp_sasl_security_options
b) smtpd_sasl_security_options
c) sasl_security_options
d) postfix_sasl_security_options

Answer: b) smtpd_sasl_security_options

42) Which of the following commands can be used to test the SASL authentication mechanism in postfix?

a) sasltest
b) authtest
c) smtpauth
d) testsaslauthd

Answer: d) testsaslauthd

43) Which of the following configuration options can be used to specify the SASL realm for postfix?

a) smtp_sasl_realm
b) smtpd_sasl_realm
c) sasl_realm
d) postfix_sasl_realm

Answer: b) smtpd_sasl_realm

44) Which of the following configuration options can be used to specify the SASL mechanism for postfix?

a) smtp_sasl_mechanism
b) smtpd_sasl_mechanism
c) sasl_mechanism
d) postfix_sasl_mechanism

Answer: b) smtpd_sasl_mechanism

45) Which of the following configuration options can be used to specify the SASL settings for TLS in postfix?

a) smtp_sasl_tls_security_options
b) smtpd_sasl_tls_security_options
c) sasl_tls_security_options
d) postfix_sasl_tls_security_options

Answer: b) smtpd_sasl_tls_security_options

46) Which of the following configuration options can be used to specify the SASL settings for CRAM-MD5 in postfix?

a) smtp_sasl_cram_md5_enable
b) smtpd_sasl_cram_md5_enable
c) sasl_cram_md5_enable
d) postfix_sasl_cram_md5_enable

Answer: b) smtpd_sasl_cram_md5_enable

47) Which of the following configuration options can be used to specify the SASL settings for DIGEST-MD5 in postfix?

a) smtp_sasl_digest_md5_enable
b) smtpd_sasl_digest_md5_enable
c) sasl_digest_md5_enable
d) postfix_sasl_digest_md5_enable

Answer: b) smtpd_sasl_digest_md5_enable

48) Which of the following configuration options can be used to specify the SASL settings for LOGIN in postfix?

a) smtp_sasl_login_enable
b) smtpd_sasl_login_enable
c) sasl_login_enable
d) postfix_sasl_login_enable

Answer: b) smtpd_sasl_login_enable

49) Which of the following configuration options can be used to specify the SASL settings for PLAIN in postfix?

a) smtp_sasl_plain_enable
b) smtpd_sasl_plain_enable
c) sasl_plain_enable
d) postfix_sasl_plain_enable

Answer: b) smtpd_sasl_plain_enable

50) Which of the following configuration options can be used to specify the SASL authentication cache in postfix?

a) smtp_sasl_auth_cache_name
b) smtpd_sasl_auth_cache_name
c) sasl_auth_cache_name
d) postfix_sasl_auth_cache_name

Answer: b) smtpd_sasl_auth_cache_name

Ashwani Kumar
Latest posts by Ashwani Kumar (see all)
0 0 votes
Article Rating
Subscribe
Notify of
guest

0 Comments
Inline Feedbacks
View all comments
0
Would love your thoughts, please comment.x
()
x