Linux configuration -- ssmtp: Cannot open smtp.gmail.com:587

Question

Hi I have RHEL5 with ssmtp installed on it ssmtp-2.61-22.el5.i386.rpm

my /etc/ssmtp/ssmtp.conf updated as below :-

[email protected]
AuthPass=mypassword
FromLineOverride=YES
mailhub=smtp.gmail.com:587
UseSTARTTLS=YES
UseTLS=Yes
RewriteDomain=gmail.com

also revaliases updated as below :

root:[email protected]:smtp.gmail.com:587

i have shutdown sendmail service

when i try to send email with ssmtp i get below error

[root@ctmtest ssmtp]# echo "test" | ssmtp -vvv [email protected]
[<-] 220 smtp.gmail.com ESMTP v26sm42795996pfi.56 - gsmtp
[->] EHLO ctmtest
[<-] 250 SMTPUTF8
[->] STARTTLS
[<-] 220 2.0.0 Ready to start TLS
ssmtp: Cannot open smtp.gmail.com:587

i searched lots of tag with this error , but unable to fix this

my system is able to connect smtp.gmail.com on port 587

[root@ctmtest ssmtp]# telnet smtp.gmail.com 587
Trying 74.125.200.108...
Connected to smtp.gmail.com (74.125.200.108).
Escape character is '^]'.
220 smtp.gmail.com ESMTP o90sm11695907pfi.17 - gsmtp

is there anyone who have fixed this ? please suggest

Solution 1

I encountered the same problem. The following steps worked for me:

1. sudo vi /etc/ssmtp/ssmtp.conf Add the following:

TLS_CA_FILE=/etc/pki/tls/certs/ca-bundle.crt [email protected] mailhub=smtp.gmail.com:587 AuthUser=XXXX AuthPass=XYXYX UseSTARTTLS=Yes UseTLS=Yes hostname=AAAA

Replace: XXXX- username(mail) XYXYX- password(mail password) AAAA- hostname(get by running $hostname)

2. sudo vi /etc/ssmtp/revaliases Add the following:

root:[email protected]:smtp.gmail.com:587

Replace : XXXX - username(mail)

3. Try running the mail now:

   $mail -s "adasdas" [email protected]

   CC: XYZLoremIpsum . 'ctrl+D'

It solved my problem. Hopefully for a system(Office) you need to configure correct proxy settings otherwise you will get an error:

cannot send message: Process exited with a non-zero status

Solution 2

try changing this option

Allowing less secure apps to access your account

https://support.google.com/accounts/answer/6010255?hl=en

Solution 3

This is perhaps because you're not setting the hostname parameter of ssmtp.conf. It should be a resolvable, fully-qualified domain name; yours is defaulting to the machine name of ctmtest (as shown in the EHLO command that you quote above).

The issue that user963 mentions in their answer may also be in action here, but in that case you'll get a different error message, something like ssmtp: Authorization failed (534 5.7.14 ...).

Solution 4

first to get your hostname type in terminal : hostname

copy it and past in hostname parameter in ssmtp.conf

Solution 5

This should be a comment on Haider Raza's answer, but I am short of 1 rep point to comment lol.

From https://superuser.com/questions/431539/special-characters-in-ssmtp-password

ssmtp has bugs parsing passwords containing '=', ':' or '#'. You can use the following workaround:

feed the password directly in the command line argument

ssmtp -ap "Hash#Password" ...

alternatively put the password in an environment variable.

ssmtp -ap $PASSWD ...

Hope it helped.

View more solutions

Comments

[Avi]

Did you find a solution to this problem?

[AlonMichaeli]

The answers below are correct, but I encountered this issue due to a network problem. The fix is documented here - stackoverflow.com/a/62062113/4196261

[AstroFloyd]

This solved my problem too; in particular, I had to add a TLS_CA_FILE=/usr/share/ncat/ca-bundle.crt line on my Arch Linux system after outgoing mail stopped working recently.

[Cameron Hudson]

Is there a mail package on RHEL? There isn't one on CentOS. Not version 7, anyway.

[FreeSoftwareServers]

Im so confused by your answer.... how does this relate to ssmtp at all

[jdavidbakr]

The mail package is installed with yum install mailx

[jdavidbakr]

Ran into the same problem, except sending via SES at AWS. The TLS_CA_FILE line also solved it for me.

[AllisLove]

Thanks for you time, thanks. God is here.

[Griner]

In artix I had to use TLS_CA_FILE=/usr/share/kf5/kssl/ca-bundle.crt