Latest SMTP Interview Questions
1. What is SMTP?
Logging into your email account to retrieve email seems fairly simple. However, there is technology working behind the scenes, such as simple mail transfer protocol (SMTP) and internet networks to ensure you can send and receive email.
Think about SMTP as a mail carrier, sorting and delivering messages to mail servers. These messages are then delivered directly to your email inbox.
2. Explain How SMTP Evolved?
Electronic messaging was created decades before the internet revolution. In the 1960s people were exploring how to communicate using mainframe computers.
The U.S. Government was the first to create a server to transmit email. In the 1970s, the mailbox protocol was developed, which was an early version of SMTP. The modern version of this technology was developed in 1982.
3. Explain How Does SMTP Work?
SMPT is responsible for transmitting email across Internet networks (IPs). This technology is used specifically for sending outgoing email.
Clients typically use applications such as Internet Message Access Protocol (IMAP) or Post Office Protocol (POP) to access to their email box. For example, if you send an email it goes to a mail server using SMTP. The mail client will then deliver it to the user’s mailbox.
4. Explain the SMTP Basic Functions?
SMTP is responsible for a little more then just deliver messages to servers. It performs several functions that streamlines the delivery process.
? It evaluates the configuration and grants permission to the computer who is trying to send a message.
? It can also track if the message was sent successfully. If it isn’t, an error message is sent to the sender.
? Extended SMTP is a little more advanced then older versions. It helps cut back on email spam.
5. Explain Resolved Limiting Factors of SMTP?
Previous versions of this technology had limiting figures, such as the location of the client within the network. SMTP allows clients to submit emails quickly regardless of the recipients location.
Thats because current SMTP technology uses a clients authentication (which are their accreditations) instead of the license IP address to send email.
6. What do you know about other protocols?
In order for computers to communicate with one another, standard methods of information transfer and processing have been devised. These are referred to as “protocols” and some of the more common ones such as TCP, IP, UDP, POP, SMTP, HTTP, and FTP
7. What is ISTP protocol?
The InterStream Transit Protocol (ISTP) is a secure protocol that allows Internet Service Providers (ISPs) to offer high bandwidth multimedia services over their networks. The ISTP application is installed as a new protocol handler into browsers.
It includes components which enable Internet Service Providers to obtain incremental revenue from subscribers, advertisers, other ISPs, and streaming video providers in exchange for using premium bandwidth services on their networks.
8. Are email addresses case sensitive?
Yes, In email address before the @, are case senstive. So email address is case-sensitive.
9. What is the meaning of return-path, reply-to and from?
From:
To:
Reply-To:
Return-path: If email is failed to deliver OR bounced, then email will return to return-path.
Reply-to: If someone reply on email, then email will be goes to reply-to.
From: It denote from where which email-address came.
10. What is the difference between ports 465 and 587?
Both are protocol.
465 is for SMTPS protocol, In this SSL encryption is started automatically before any SMTP level communication.
587 is for MSA protocol. SSL encryption may be started by STARTTLS command at SMTP level(if server supports). In this ISP does not filter server’s EHLO reply.It helps to stop outgoing spam email.
11. How to check if an email address exists without sending an email?
You can to execute below command.
12. RCPT TO: [email protected]
This identifies the recipient of the email message. This command can be repeated multiple times for a given message in order to deliver a single message to multiple recipients.
13. How to check if smtp is working from commandline?
telnet {smtp_domain_name} {smtp_port}
14. Simple mail transfer protocol (SMTP) utilizes ____ as the transport layer protocol for electronic mail transfer.
a) TCP
b) UDP
c) DCCP
d) SCTP
Answer:a
15. SMTP connections secured by SSL are known as
a) SMTPS
b) SSMTP
c) SNMP
d) none of the mentioned
Answer:a
16. SMTP uses the TCP port
a) 22
b) 23
c) 24
d) 25
Answer:d
17. Which one of the following protocol is used to receive mail messages?
a) SMTP
b) post office protocol
c) internet message access protocol
d) all of the mentioned
Answer:d
18. What is on-demand mail relay (ODMR)?
a) protocol for SMTP security
b) an SMTP extension
c) protocol for web pages
d) none of the mentioned
Answer:b
19. An email client needs to know the ____ of its initial SMTP server.
a) IP address
b) MAC address
c) url
d) none of the mentioned
Answer:a
20. A SMTP session may include
a) zero SMTP transaction
b) one SMTP transaction
c) more than one SMTP transaction
d) all of the mentioned
Answer:d
21. SMTP defines
a) message transport
b) message encryption
c) message content
d) none of the mentioned
Answer:a
22. Which one of the following is an SMTP server configured in such a way that anyone on the internet can send e-mail through it?
a) open mail relay
b) wide mail reception
c) open mail reception
d) none of the mentioned
Answer:a
23. SMTP is used to deliver messages to
a) user’s terminal
b) user’s mailbox
c) both (a) and (b)
d) none of the mentioned
Answer:c