I am trying to send email through gmail via postfix, but it shows me the following error: Must issue a STARTTLS command first. Sep 6 01:11:34 NovusTec postfix/smtp[10889]: 1284460D68: to=<[ema...

I've been trying to get postfix setup so that it can SEND (don't need it to receive) emails out to users on my website (such as account validation emails). I install postfix through mailutils (ins...

I'm using postfix to send email via gmail with an application's password (two step-validation activated). Each time I test sending mail using sendmail command, I get this error: Action: delayed S...

I know there are some other questions (with answers) to this topic. But none of these was helpful for me. I have a Postfix server (postfix 3.4.14 on Debian 10 (Buster)) with the following configura...

Previously working Dovecot / Postfix / DKIM setup with multiple domains working correctly for months. I attempted to add a new domain name. Retracing what I did for the original ones. Once I got p...

I have configured postfix to relay mail to Amazon SES by following their integration guide and sending email is working without issue. However, I recently wrote a PHP application using a framework...

I'm successfully sending mail using PHP using the mail() function but the sending is showing up as the server address and not what I have configured in the script. Postfix is installed on the apach...

I have postfix+dovecot. I want to make bash script which can use SMTP for this. I don't want use sendmail. Is it possible? May be someone has some examples of code?

I've upgraded my Postfix mail system from opendkim to dkimpy in Debian Stretch using Backports, because I'm trying to implement ARC signing and verification. I was able to get dkimpy working in so ...

The 'Content-Transfer-Encoding' setting is set to '7bit' by default. The mail server Postfix is breaking down the email header by bunch of 1000 caracteres, meaning that if you have a long email (us...

I am configuring Postfix and when validating by telnet and SMTP I got the status bounced error, unknown user: Error log: postfix/local[18718]: 4590D7DC0A51: [email protected], relay=local, de...

I can not solve the problem of spam. I only have 7.6 / 10 on Mail-Tester.com. I specify that I use postfix, and I need it only for the sendings. Here is my result: https://www.mail-tester.com/web...

I am facing problem on sending mail from my osx swift application. To send mail i used the below code import Foundation import Cocoa class sendemail : NSObject, NSSharingServiceDelegate{ func s...

Using terraform v0.12.9 and building a file using template_file data source, I could not use double dollar signs $$ to treat input ${data_directory} as literals. Looking for solution to sort out t...

I need to deactivate RepeatedMsgReduction on my Linux server to allow fail2ban to evaluate every failed login attempt. (See this bug report: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=440037)...

I've already answered my own question and may later update this question to reflect on my starting point/the steps I took to get to my solution, but figured I would ask a question that I started wi...

I met this weird problem, and I tried a whole afternoon to solve this, with all the methods I found from google, but till now, nothing seems to be worked. My ubuntu server's (10.04 LTS) timezone i...

I know this might be a dummy question or a question that comes from lack of knowledge, but I hope someone can still answer it. I did try to read a lot of Postfix documentation but found no answer t...

These ports 465 and 587 are both used for sending mail (submitting mail) but what is the real difference between them?

I'm getting this error: raise SMTPRecipientsRefused(senderrs) smtplib.SMTPRecipientsRefused: {'[email protected]': (550, '5.1.1 : Recipient address rejected: hotmail.com')} when trying ...

I'm using this online guide here to enable simple mail sending from linux (ubuntu) terminal with postfix through some gmail account. I've done the steps listed there: sudo apt-get install postfix ...

I have set up postfix on a server, along with openDKIM. When I run: echo "Testing setup" | mail -s "Postfix test" {my_email_address} I get the email, and in the mail headers there is a DKIM-Sig...

How do I convert negative numbers from infix to postfix ? Suppose I have a expression a = - b - (-c-d) In some places I read that you can parathesize the negative numbers like a = (-b) - (-c-...

I have searched several posts on this but no luck. Everyone is using postfix. But when I gone through the text on https://help.ubuntu.com/community/Postfix What is a Mail Transfer Agent In oth...

Google's compute engine blocks all outgoing email ports by default. Quote from Compute Engine Documentation Compute Engine blocks or restricts traffic through all of the following ports/protocol...