Collaborate Disseminate
On my Debian boxes, I installed postfix which forwards my local mails (ie from cron) to my service account on my mailserver. So postfix is configured to use my mailserver as a relay. This works pretty fine for all my Debian hosts.
Now I re… Continue reading Email forwarding on MacOS w Homebrew [migrated]
I am trying to set up an email server using postfix, dovecot and roundcube, I am following the official documentation. I have set up separate servers for intranet and internet emails as well as set up TLS (for internet), clamav and spamass… Continue reading What can be practical vulnerabilities in an email setup? [closed]
I am working on a server software that receives an utf-8 encoded email address to send an email to.
I permit multibyte unicode characters (emoji etc.). Then I pass that email address to Sendmail to send an email with Postfix.
Is that dange… Continue reading Is OK to accept multibyte unicode codepoints as recipient address for Sendmail and Postfix?
I have a web server. I was investigting why my nginx is keep crashing. I noticed a few other issues in my logs.
Note: In the log report, I replace the name of my website with example.com and my second domain with example2.com and my server… Continue reading Is my website under attack?
Today I received a phishing mail from my own (valid) sender address (info@example.com).
I checked the e-mail header and see the mail was received by my valid mailserver.
Received: from mail.example.com ([::1]:36128) by domain.1blu.de (kopa… Continue reading Spam mail from own mailserver, but there is no outgoing mail in postfix log? [duplicate]
External (other) Mail clients have started to deny/de-list anonymous ciphersuites. But the TLS support is often spotty. Worse, some clients (mainly Windows, which does not care one whit about your RFC specs or lists of common protocols and… Continue reading Dealing with particular clients wrt TLS support in postfix?
Port 25 is open and I’m getting thousands of emails. How can I make it stop?
Continue reading My postfix server is getting DOSed, what can I do?
Which ciphers to be used currently, and which protocols to be used in opportunistic TLS for postfix SMTP
Continue reading Which ciphers to be used currently, in opportunistic TLS for postfix SMTP [closed]
I am working on a postfix server which only sends mails (newsletters)
I have read i should enable TLS and/or SSL on postfix in order to increase mail deliverability performance. Is it true ?
Is there a difference between SSL and TLS und… Continue reading Enable TLS/SSL on postfix [migrated]
Someone or “something” is trying to access the server.
my postfix log showed:
mx2 postfix/smtpd[*****]: lost connection after MAIL from unknown[127.0.0.1]
My concern is why is it from the localhost? and I just can’t figure it out with… Continue reading Unauthorized access postfix "lost connection after MAIL from unknown[127.0.0.1] "