0
votes
1answer
1k views

linux ssmtp error Cannot open smtp.gmail.com:587

I can not route may emails vie gmail.com. I use ssmtp facility. My config files in /etc/ssmtp are root:yyyyy@gmail.com:smtp.gmail.com:587 maciek:yyyyy@gmail.com:smtp.gmail.com:587 and ssmtp.conf: ...
1
vote
1answer
193 views

Is it possible to configure sendmail to require/use certain ciphers during TLS negotiation?

CentOS 5.x | SendMail I'd like sendmail to use a specific cipher when negotiating a TLS session with a specific remote MTA/domain. Is that possible? I'm aware that a minimum bit strength can be ...
0
votes
1answer
171 views

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 ...
2
votes
0answers
209 views

Forcing IIS virtual smtp server to verify outgoing TLS certificate

I am in a situation where a web application is using the IIS virtual SMTP server to send out email. The IIS virtual SMTP server is then configured to send all mail out through a smarthost, over TLS ...
0
votes
2answers
412 views

How to send email from non-TLS enabled client through TLS-only Gmail account

I need to be able to send email from a client (an OKI document scanner) which is non-TLS capable. But my company's email service is provided by Gmail-Google Apps, which is configured to force TLS ...
2
votes
1answer
2k views

How to change sendmail fallback behavior if TLS handshake fails?

I have a CentOS 5.x server running sendmail that is failing to negotiate TLS with SOME various recipient servers. I'm looking into it. In the meantime though, I've noticed that sendmail will NOT ...
0
votes
1answer
156 views

Configuring sendmail to only use starttls in client mode

Is it possible to configure sendmail so that it will only connect to a remote smtp server when STARTTLS is offered there? I so - how do I do it?
0
votes
1answer
304 views

How to generate new CSRs for TLS use in sendmail?

SendMail 8.13.8 | CentOS 5.x Hi Guys, I'm using ca-signed TLS certificates on my sendmail server and they are up for renewal soon. Our new CA doesn't like our old CSR so I need to generate a new ...
1
vote
2answers
8k views

Is it possible to set up Exchange so that all outbound emails to a specific domain must go through TLS?

And that, if that domain doesn't have TLS turned on, email-sending fails? I've been looking at setting up SMTP send connectors, but there doesn't seem to be an option to enforce TLS?
0
votes
3answers
442 views

Secure email routing

We have relationships with some banks that are trying to implement some secure email. Is there any method that would force the server to send emails via TLS when sending email to a specific domain? ...
0
votes
3answers
4k views

Postfix & TLS is configured correctly, but Thunderbird throws cryptic errors when trying to send email via SMTP & STARTTLS?

I've just recently installed CentOS 5.5 and Postfix for the first time ever. I've followed 2 different tutorials which are supposed to enable TLS on the SMTP server. Both of which told me to create a ...
2
votes
1answer
1k views

How To Tell SendMail To Explicitly NOT Try TLS For A Domain

CentOS 5.x | Sendmail Hi Guys, I have sendmail setup to perform opportunistic TLS but would like to never use TLS when sending to a specific domain. Is there an entry I can add to /etc/mail/access ...
0
votes
3answers
985 views

cPanel configuration appears to allow unauthenticated SMTP - how to fix?

One of my clients is using a cPanel-based Virtual Dedicated Server that appears to allow unauthenticated SMTP: bash$ echo EHLO | nc mail.clientscompany.com 25 ... 250-SIZE 52428800 250-PIPELINING ...