All Questions
29
questions
1
vote
1
answer
105
views
Postfix: Mail servers of certain providers are unable to send mail to my Postfix server / insufficient security / SSL alert number 71
There is big German email hoster (web.de) whose mail servers are not able to send mails to my self-hosted Postfix server. I found similar reports, but the published solutions always were misconfigured ...
- 299
0
votes
2
answers
108
views
In Postfix, Should SSL FQDN Matches with myhostname or mydomain field in /etc/postfix/main.cf?
Quoted from the documentation:
myhostname
The internet hostname of this mail system. The default is to use the fully-qualified domain name (FQDN) from gethostname(), or to use the non-FQDN result ...
- 203
1
vote
1
answer
264
views
Warning with sending emails from Thunderbird to Postfix using its own CA
I'm asking for help because I simply don't have the strength anymore, I've spent a lot of time and I'm still left with an unsolved puzzle.
My problem: I keep getting "Wrong Site" warnings ...
- 31
1
vote
0
answers
301
views
Not receiving any response from SMTP server after successfully connected via openssl or telnet
I am trying to set up my postfix using Gmail smtp relay server. I have set it up in other servers without issues, but I am having difficulty getting it to work in my work network.
I tested if there is ...
0
votes
0
answers
1k
views
SSL decode error/eof postfix
Recently started receiving this error and unable to find any solution to this, any ideas?
OpenSSL version: OpenSSL 3.0.4 21 Jun 2022 (Library: OpenSSL 3.0.4 21 Jun 2022)
Postfix version: mail_version =...
- 1
1
vote
0
answers
1k
views
Postfix smtp vs smtpd -o options
Table below shows which protocols/ports could be used in each step of the email transfer. Table also indicates which protocols/ports I want to use on my postfix server setup by marking them with ✘ or ✔...
- 403
0
votes
1
answer
1k
views
Certbot — Post-Handshake New Session Ticket arrived
At the start of the negociation, Secure Renegotiation IS NOT supported occurs. During the last Session Ticket (and perhaps the one before), it seems that the SSL connection succeeded. Could you let me ...
- 123
-1
votes
1
answer
6k
views
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 ...
- 9
0
votes
1
answer
3k
views
No STARTTLS with Dovecot and Postfix
I have done a lot of searching and am not finding a solution.
I had to reload Mageia 6 on my email server. I am using dovecot-2.2.34-1.mga6 and postfix-3.1.6-1.mga6. Openssl is openssl-1.0.2o-1....
-1
votes
1
answer
328
views
openssl self signed sertificate, need 3 files, got only 2
Hello I try to config my mail server, I do :
sudo openssl req -newkey rsa:4096 -nodes -sha512 -x509 -days 3650 -nodes -out /etc/ssl/certs/server.pem -keyout /etc/ssl/private/server.pem
but in ...
- 145
1
vote
1
answer
1k
views
Dovecot returns localhost.localdomain certificate
I'm having an issue with Postfix+Dovecot configuration in Ubuntu 16.04. I could configure my mailboxes and I can correctly send and receive emails and now I wanted to set up POP3+IMAP.
The problem I'm ...
- 21
2
votes
0
answers
5k
views
Dovecot configuration issue: Aborted login (no auth attempts in 0 secs): user=<>
I've set up a test server per the tutorial on https://arstechnica.com/information-technology/2014/02/how-to-run-your-own-e-mail-server-with-your-own-domain-part-1/
The problem is in trying to login ...
- 133
1
vote
1
answer
447
views
Enable RC4-SHA in Postfix for old Exchange compatibility
I'm running a Debian Jessie mailserver using Postfix 2.11.3-1 with OpenSSL 1.0.2k-1. Recent changes to Debian policy have disabled several older insecure ciphers. Unfortunately some of the mailservers ...
- 33
3
votes
4
answers
6k
views
Disabling a cipher / cipher suite in postfix / TLS for specific recipient
We use Postfix 2.9.4 and OpenSSL 0.9.8j-fips 07 Jan 2009 (SLES11 SP4).
We get this error message while sending mail to a specific recipient:
error:1408D13A:SSL routines:SSL3_GET_KEY_EXCHANGE:unable ...
- 61
0
votes
1
answer
4k
views
postfix SSL routines:SSL3_GET_KEY_EXCHANGE:unable to find ecdh parameters
We recently had this error while our postfix MTA tries to encrypt a connection via TLS:
postfix/smtp[20716]: warning: TLS library problem: 20716:error:1408D13A:SSL routines:SSL3_GET_KEY_EXCHANGE:...
- 61