Sendmail is a server application that gives businesses a way to send email using the Simple Mail Transfer Protocol (SMTP). It’s typically installed on an email server on a dedicated machine that accepts outgoing email messages and then sends these messages to the defined recipient.
What is Sendmail on Linux?
On Unix-like operating systems, sendmail is a general purpose e-mail routing facility that supports many kinds of mail-transfer and delivery methods, including the SMTP (Simple Mail Transfer Protocol) used for e-mail transport over the Internet.
How does Sendmail work Linux?
The sendmail program collects a message from a program like mailx or mailtool , edits the message header as required by the destination mailer, and calls appropriate mailers to deliver mail or to queue the mail for network transmission. The sendmail program never edits or changes the body of a message.
Does anyone still use Sendmail?
A look at MailRadar.com shows that Sendmail is still the No. 1 MTA (mail transfer agent) in use today, followeded by Postfix, while Qmail is a distant third.
Where is Sendmail configuration in Linux?
The main configuration file for Sendmail is /etc/mail/sendmail.cf , which is not intended to be manually edited. Instead, make any configuration changes in the /etc/mail/sendmail.mc file. The leading dnl stands for delete to new line, and effectively comments out the line.
Is sendmail deprecated?
Note that Sendmail is considered deprecated and users are encouraged to use Postfix when possible. …
How do I know if sendmail is running on Linux?
Type “ps -e | grep sendmail” (without quotes) at the command line. Press the “Enter” key. This command prints a listing that includes all running programs whose name contains the text “sendmail.” If sendmail is not running, there will be no results.
How do I configure sendmail?
So, the steps I recommend for configuring sendmail are as follows:
- Edit the /etc/sendmail.mc file. Most of what you need to do to configure sendmail can be done by editing this file.
- Generate the sendmail.cf file from the edited sendmail.mc file. …
- Review your sendmail.cf configuration. …
- Restart the sendmail server.
How do I know if mailx is installed on Linux?
On CentOS/Fedora based systems, there is only one package named “mailx” which is the heirloom package. To find out what mailx package is installed on your system, check the “man mailx” output and scroll down to the end and you should see some useful information.
What is in Sendmail?
Sendmail is an application that includes SMTP functionality and configurations, but SMTP is the protocol used to send email messages. … Sendmail takes each recipient address and attaches them to the body and header file and then sends the message to the specified recipient.
Which is better postfix or sendmail?
In comparison to other MTAs, Postfix emphasizes security. Postfix is much more secure than Sendmail, which has weak security architecture. Postfix is designed to overcome the vulnerabilities that are associated with Sendmail. Moreover, a good Postfix configuration secures sensitive data from spam, abuse, and leakage.
Is sendmail a SMTP server?
Sendmail is a general purpose internetwork email routing facility that supports many kinds of mail-transfer and delivery methods, including the Simple Mail Transfer Protocol (SMTP) used for email transport over the Internet. …