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Questions tagged [smtp-auth]

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How to send email on behalf of a customer, such that they handle replies?

Scenario: I have a customer A, who authorizes me / my software to send email on their behalf to their customers P, Q, etc. Additionally, P, Q, etc. should see the email as coming from a.example.com. And finally, A should be able to see the email I…
MarnixKlooster ReinstateMonica
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Postfix Recipient address rejected: Access denied error after removing permit_mynetworks

I have a mail server which have to remove "permit_mynetworks" from Postfix configuration file(main.cf) in case of abuse. I only set it to allow SASL autheniented relay. But now, postfix would reject any foreign recipients. Can somebody please tell…
Cooper Max
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Postfix: Disable SMTP Authentication for specific email addresses?

I've got a server running postfix, in my main.cf, I'm using smtp_sasl_auth_enable = yes smtp_sender_dependent_authentication = yes I've got about 30 different email addresses (different domains, mostly Gsuite), and everything is working great. My…
MrFent
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.NET program sending of email not working on client server only

I've originally asked this in SO but it seems this is a more appropriate place. Basically, I have a program that sends email which works on my local machine and on our company's server. However, it's not working when deployed on the client's…
Lawrence
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SMTP authentication issues with Postfix Dovecot

I had bought a domain example.com and a VPS, and I used iRedMail to set up a mailserver. Not wanting iRedMail to mess up with my Nginx, I decided to install Nginx and Roundcube by myself. However, it says the SMTP server doesn't support auth. SMTP…
Sam
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MS Exchange: How to enable SMTP to use OAUTH2.0 but with basic AUTH disabled

(I have asked this question also on stackoverflow but I now think that this might be a more useful community to ask hence I am also posting here.) I am trying to know whether it is possible to enable SMTP to use OAUTH2.0, but with basic AUTH…
user663702
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Postfix dovecot unable to authenticate

I use to work with postfix/sasl/courrier-auth on Gentoo for years. I just migrated to Debian 10 postfix/dovecot. I'm unable to make it work : Send mail ok, TLS ok. But unable to authenticate (SMTP 587, IMAP 993). I'm not familiar with dovecot and I…
user625434
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SMTP Untrusted TLS connection still sending emails

When sending mail from my client through a mail server that is then using AWS SES as a mail relay I'm seeing this in the postfix log as each message moves through: smtp: Untrusted TLS connection established to…
Meltemi
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Dovecot as Proxy with submission

In my infrastructure I have several mailservers (mailcow) serving different domains per instance. I want to build a mail-proxy in front of them to reduce the number of used IPs per service and allow customers to have their own domain names in their…
TRW
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Postfix encryption not available

EDIT #2 What's this error? Aug 17 02:27:19 mail postfix/smtpd[1197]: lost connection after CONNECT from unknown[x.x.x.x] Aug 17 02:27:19 mail postfix/smtpd[1197]: disconnect from unknown[x.x.x.x] Aug 17 02:27:19 mail postfix/smtpd[1199]: lost…
Polaq
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Sending mail from java servlet fails authentication

Centos7, tomcat 9, Exim 4.94 Moved all my tomcat apps from centos6 to centos7 server. Tomcat version is 9 and was the same on both servers. I send email from one of the java apps. public void sendEmail(String toAddress, String subject,…
ScottD
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How to get gmail to use postfix as an SMTP server

I'm trying to get gmail to send email from my vanity domain - it understandably wants to use an SMTP server set up for that domain. I tried to configure postfix to be an SMTP server for my vanity domain, but in gmail I keep getting authentication…
Steven Hook
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How to configure exim4 for both incoming SMTP for local delivery and relay for authenticated user

I want to use my exim4 mail server as local delivery for anonymous sender for my localdomains, and relay to everyone only for authenticated users. Is it possible?
Tobia
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Secure postfix smtp from spammer

I run on Centos 5 with Parallels Plesk 12 and look for to secure my smtp server. When I watch at log, I see some strange line like that, which I supposed it's hack connexion. Has someone any idea on how to secure my server from this ? Oct 10…
Alexis G
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Exchange 2010 view SMTP authentications

Is there a way to view authenticated SMTP Sessions? We are getting lots of SMTP traffic in our tracking logs at odd hours of the day. What I'd like to do is to see which user(s) are sending SMTP messages during those hours. Is this possible? After…
alcomcomputing
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