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Questions tagged [starttls]

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.

112 questions
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Is TLS necessary for port 25 for MX delivery?

I am in the process of implementing a new Postfix implementation on an existing environment which is extremely old. While doing so I am requiring all clients to connect securely on either 465 or 587 for relay access. The existing postfix…
Michael Moser
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Does anything changes for a client in the API communication after the command STARTTLS is sent and a response received

I'm trying to understand how the command STARTTLS in IMAP works exactly and what becomes different when it's sent. After I've sent the command "STARTTLS" before login process and received the response "OK Begin TLS negotiation now" as a client, does…
Johshi
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Gitlab with OpenLDAP secured with TLS

I have a working, secure OpenLDAP server running at: auth..com I also have a reader account that Gitlab can use: cn=Reader Reader,ou=users,dc=auth,dc=,dc=com Our setup is secured with STARTTLS. Our server will accept no…
Andrew M.
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postfix on local webserver to forward notification mails to customer emails adresses

I have running a web application on a hosted web server. The web application needs to send out emails to different client email adresses. The flow would be : Local WebApplication -> Local Postfix SMTP Server(Port 25) -> Forward Email to Any Remote…
Sven Kirsten
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1 answer

Outlook 2010 can receive but not send - authentication fails - Thunderbird works

After the mailserver was upgraded from CentOS6 to CentOS 7, Outlook 2010 on Windows 7 can receive email but not send, the error says authentication failed. However Mozilla Thunderbird can receive and send. In the email account SMTP settings 'My…
Nick W
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Postfix 3.4.9 SSL issues -- no shared cipher from servers using TLSv1

Edit 1: I've narrowed it down to TLSv1 that both servers listed below (no others have failed yet) are attempting to use. I'll be contacting their webmasters requesting they stop using an insecure protocol but in the mean time would still like to…
Chris B
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no STARTTLS in inbound email to exim

I have a CentOS VPS and I'm using Exim 4.7.2 For some days I have an issue in Thunderbird and in other client because seems STARTTLS not work in incoming email only outgoing e-mail. How can I fix this?
Marco
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