How To Send E-Mail On CentOS 7

simply-sending-e-mails-with-mailx.md

Installing mailx

yum -y update

yum install -y mailx

We can now start sending e-mails using

create a symbolic link

ln -s /bin/mailx /bin/email

###Set an External SMTP Server to Relay E-Mails

vi /etc/mail.rc

edit

set smtp=smtps://smtp.gmail.com:465
set smtp-auth=login
set smtp-auth-user=USERNAME@YOURDOMAIN.COM
set smtp-auth-password=YOURPASSWORD
set ssl-verify=ignore
set nss-config-dir=/etc/pki/nssdb/

example usage :

echo "Your message" | mail -v -s "Message Subject" email@address

Thank you for this.

For servers that use port 587 you might need to change one line and add another:

set smtp=some.server.com:587 # change protocol here
set smtp-use-starttls        # add this

Also you may get a "550 Sender address is not allowed.", which implies you need to add another field:

set from="someuser@address(John Doe)"

Just for general information, if you're getting the following error, you'll have to allow access of less secure apps in Google Account settings.

smtp-server: 534-5.7.14 <https://accounts.google.com/signin/continue?sarp=1&scc=1&plt=????????
smtp-server: 534-5.7.14 ????????????????????????????????????????????????????????????????????????????????????????
smtp-server: 534-5.7.14 ????????????????????????????????????????????????????????????????????????????????????????
smtp-server: 534-5.7.14 ????????????????????????????????????????????????????????????????????????????????????????
smtp-server: 534-5.7.14 ???????????> Please log in via your web browser and
smtp-server: 534-5.7.14 then try again.
smtp-server: 534-5.7.14  Learn more at
smtp-server: 534 5.7.14  https://support.google.com/mail/answer/78754 b2sm612744qtj.84 - gsmtp

Thanks you!

Getting below error -

Resolving host smtp.gmail.com . . . done.
Connecting to 74.125.24.109:465 . . .Connecting to 74.125.24.108:465 . . .Connecting to 2404:6800:4003:c03::6c:465 . . .could not connect: Network is unreachable
"/root/dead.letter" 10/253

Please help

It is not working , problem with this error, please let me know
Resolving host smtp.outlook.com . . . done.
Connecting to 40.97.127.146:465 . . .

Thanks you!

For configure the mailx on crond: https://unix.stackexchange.com/questions/290573/calling-mailx-from-crond

Hello,
Below are my mail.rc files configurations and still I'm getting an error.

#SMTP Configuration
set smtp-use-starttls
set ssl-verify=ignore
set smtp-auth=login
set smtp=smtp://smtp_server_I_want_to_connect:587
set from="my_email_address"
set smtp-auth-user=my_email_address
set smtp-auth-password=my_password
set nss-config-dir=/etc/pki/nss

#Error.1

STARTTLS
220 2.0.0 SMTP server ready
Error initializing NSS: Unknown error -8015.
"/root/dead.letter" 11/324

after changing
set nss-config-dir=/etc/pki/nss -> set nss-config-dir=/etc/pki/nssdb

Error.2

220 2.0.0 SMTP server ready
Error in certificate: Peer's certificate issuer is not recognized.

Please help and thank you in advanced.

smtp-server: 550 5.8.1 Local user only.
"/root/dead.letter" 11/319
. . . message not sent.

if u get the same error, maybe try vim /etc/mail.rc and add a line, set from=youremail@address

It worked. Thank you.
I was using
set smtp=smtps://smtp.gmail.com:587
It got me error on handshake changed to
set smtp=smtps://smtp.gmail.com:465

getting below error:

SSL/TLS handshake failed: Unknown error -5961.
"/root/dead.letter" 11/337
. . . message not sent.

Getting below error -

Resolving host smtp.gmail.com . . . done.
Connecting to 74.125.24.109:465 . . .Connecting to 74.125.24.108:465 . . .Connecting to 2404:6800:4003:c03::6c:465 . . .could not connect: Network is unreachable
"/root/dead.letter" 10/253

Please help

if you are using the EC2 instance from aws, you must have an autorisation from aws to send emails! they dont allow peaple to send emails befor be certain that they are not a SPAMERS !!

It is not working , problem with this error, please let me know
Resolving host smtp.outlook.com . . . done.
Connecting to 40.97.127.146:465 . . .

if you are using the EC2 instance from aws, you must have an autorisation from aws to send emails! they dont allow peaple to send emails befor be certain that they are not a SPAMERS !!

Thanks ilkereroglu for your sharing!

In my virtual instance, Linux CentOS 8 works perfectly, in case you want to configure a Gmail account with 2Factors enabled, it is needed to you the app password: error received:

535-5.7.8 Username and Password not accepted. Learn more at
smtp-server: 535-5.7.8 Username and Password not accepted. Learn more at
535 5.7.8 https://support.google.com/mail/?p=BadCredentials a22sm8057227wmj.9 - gsmtp
smtp-server: 535 5.7.8 https://support.google.com/mail/?p=BadCredentials a22sm8057227wmj.9 - gsmtp

Article to follow in Google Help Center.

I'm getting this error. Can anyone help?

SSL/TLS handshake failed: Unknown error -5938.
"/root/dead.letter" 11/410
. . . message not sent.

[root@serv-pru-apache etc]# echo "hola mundo lindo ahora son las: $(date)" | mailx -s "hola probando" soraya@correo.es

[root@serv-pru-apache etc]# Error in certificate: Peer's certificate issuer is not recognized.
smtp-server: 535 5.7.0 Invalid username or password
"/root/dead.letter" 11/365
. . . message not sent.

Can anyone help?