STARTTLS is the SMTP command to connect to email servers securely over TLS (formerly SSL). Use with an email server tag like [postfix], [exchange], etc.
Questions tagged [starttls]
106 questions
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Does DNS need to be pointed toward the right sever, for SSL to work
So the issue I'm having, is with a new mail server I've been setting up. Now it seems to work fine when not using ssl. And if I try using ssl, with a mail client like airmail it says host name mismatch. Now my question is could it be because our DNS…
reaper
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Can't connect to Exchange 2016 with port 587 TLS
Hi everyone i'm having issues with SMTP notifications connecting on port 587 with TLS.
Right now I have an internal Exchange 2016 server and all email works great. I have a few customers who have software (mainly backup software) that can have SMTP…
MindExplosion
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How to force postfix to deny all non TLS queries?
I have a server with postfix and a plain text authentication.
It accepts both TLS and non-TLS authentication.
How can I force the server to deny all non TLS queries so that the mail users never send their username and passwords in clear text when…
j1088099.mvrht.com.
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Unable to send email from Command Line in Postfix (warning: TLS library .....)
I configured postfix with ssl/tls. and created an smtp. However I am unable to send test email and/or login.
"Text below first defines error log (different attempts) and then configuration files."
Error log on terminal.
[First Attempt]
[root@domain…
nix
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I can't send a message with postfix. Error: "Must issue STARTTLS first"
I am novice with postfix. My goal is to use it with fan/nagios/centreon in order to receive notifications.
I have tried many solutions found on this forum or thanks to google, but it didn't resolve my problem.
My server is based on Centos release…
ayelis
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STARTTLS sendmail handshake failures on SMTP and retries
I'd like to gracefully handle sendmail STARTTLS handshake failures. On outgoing mail, it would be best if there were an immediate retry without STARTTLS in the case of failure. On inbound mail, ideally a site that caused handshake failures would be…
M. Paul
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How to make Postfix SMTP TLS Optional?
Just did an [emergency] conversion from qmail to postfix last night - but now I'm getting people complaining that mail client errors are showing up stating "no available encryption methods available" - switch them to use TLS over port 587 & they…
Sean Kimball
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Dovecot STARTTLS fails using fetchmail
I currently try to get my own mail server up and running. So far everything seems fine as I am able to connect to this mailserver using thunderbird. The only thing I have to do is accepting my own (self-signed) certificate.
Now as everything seems…
Sebastian
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SMTP doesn't work on distinct machine
I'm trying to setup TLS e-mail on remote machine, but it doesn't work.
Trying to send e-mail on my local machine (Windows 7 x64 locale ru-ru):
16:33:18 CONNECT : Looking up host name mail.domain.com...
16:33:18 CONNECT : Host name…
Okloks
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starttls fails after IP address change
I have changed the IP address of our exim mail server (the virtual machine has been copied to a different host, also the network configuration is using NAT). Now it no longer accepts STARTTLS connection from a Windows Thunderbird client. It works…
nn4l
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Exim says "The request is invalid" during gnutls_handshake
I have Debian wheezy and setup Exim to listen to port 587, where users can authenticate using TLS. I'm testing it with Thunderbird 31.1.2. When I try to send a message, Thunderbird displays this:
Sending of message failed.
The message could not…
Antonis Christofides
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SMTP Connection disconnecting after "STARTTLS"
We're having issues with our mail server. Basically some emails from external networks are not being accepted by the mailserver.
After some debugging using telnet and looking through the logfiles, it seems that the issue has to do with encryption…
Khronos
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Postfix & Gmail: Authentication Required error
I configured Postfix using this guide. When I send a test E-Mail I get the following error message:
May 23 15:36:26 VM11 postfix/smtp[15321]: connect to smtp.gmail.com[2a00:1450:4001:c02::6d]:587: Network is unreachable
May 23 15:36:26 VM11…
Bastian
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postfix, TLS and rapidssl - "verify error:num=19:unable to get local issuer certificate"
I have a certificate from rapidssl. I run this command:
openssl s_client -showcerts -connect smtp.server.com:465
I get this error:
verify error:num=19:self signed certificate in certificate chain
Here is what I have in my postfix main.cf, and what I…
technobuddha
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Configuring postfix to use TLS for a particular server?
Running kubuntu 10.04 on my host, let's call it alpha. I've got postfix as my system MTA. I've got crons running on alpha that need to send email to a remote host, let's call it mailhost. I cannot alter any configs on mailhost.
Normally I use…
dirtside
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