Questions tagged [smtp]
SMTP is the Simple Mail Transfer Protocol, the most recent standard of which is defined in RFC 5321. It's the Internet standard for sending and receiving email.
595
questions with no upvoted or accepted answers
4
votes
1
answer
7k
views
IIS SMTP TLS encryption issue
I enabled TLS in IIS SMTP Virtual Server with a self-signed server certificate. Made sure that the certificate has the FQDN of the server. Checked the TLS encryption checkbox in Virtual SMTP > ...
- 49
4
votes
0
answers
483
views
How can I explicitly disable TLS when sending to one specific recipient?
I have a SendMail 8.14 server deployed in the middle of an SMTP workflow (Outbound mail looks like Exchange -> SendMail -> Appliance -> Internet)
I have TLS configured for the first three hosts. ...
- 12.1k
4
votes
1
answer
3k
views
When does Postfix not perform lookups in virtual_alias_maps?
I'm having a real pickle of a problem:
I have a Postfix 2.6.6 / CentOS 6 server that's set up to forward mail from specific aliases to specific destinations. This is done through a mysql ...
- 722
3
votes
1
answer
500
views
Configuring mailiers in Phabricator
After a clean installation using the bitnami image I followed the instructions to set up the mailers.
It looks like this:
[
{
"key": "stmp-mailer",
"type": &...
- 81
3
votes
0
answers
295
views
Why is Exchange 2010 SMTP not rejecting external messages to internal-only groups?
TL;DR: How do I make sure that the SMTP server doesn't accept external messages for distribution groups that are set to require authentication?
I have an Exchange 2010 server that has multiple ...
- 398
3
votes
2
answers
948
views
Can't find the IP address of a Saslauthd login attempt
I need help locating the origin IP from this error messages/ login attempts:
From the 'sasl auth daemon' via Logwatch:
pam_unix(smtp:auth): check pass; user unknown
pam_unix(smtp:auth): ...
- 41
3
votes
1
answer
437
views
Is it possible to change sendmail behavior on "Host unknown" errors?
Sendmail 8.14.4
I had DNS issues resulting in a DNS server thinking that a hostname wasn't available (when in fact, it was available).
That resulted in the following delivery log entry in sendmail:
...
- 12.1k
3
votes
0
answers
1k
views
Don't send outgoing mail via Spamassassin
My e-mail server is running Postfix 2.11.3 on Debian 8.7 (Jessie) with Spamassassin 3.4.0.
I realized that my outgoing e-mails are also being checked for spam, which not only seems to be unnecessary ...
- 1,541
3
votes
0
answers
112
views
Combating a persistent spam list
We use Office 365 as our primary mail provider. We have an internal mail server that we use for relaying things like reports from our SSRS, scan to inbox for old scanners, etc. It is an IIS SMTP on ...
- 455
3
votes
1
answer
132
views
SMTP authentification request transfer to another SMTP
I'm having an issue that's above my competence level. As we're working on improving the security measures that are in place in our network, we found (among others) one flaw that we have no idea how to ...
- 31
3
votes
0
answers
206
views
Postfix STARTTLS works in LAN but not externally
if I connect in LAN on port 25 to my mail server, it offers STARTTLS
telnet mailserver.com 25
Trying 192.168.0.x...
Connected to mailserver.com
Escape character is '^]'.
220 mailserver.com ESMTP ...
- 59
3
votes
0
answers
4k
views
hMail Server SSL Certificate Verify Issue | TLS/SSL handshake failed
I will tell you my situation step by step and ask me any necessary questions and help me to fix hmail certificate issue.
First of all :
1-
i am using a windows server 2008 - r2
2-
latest hmail ...
- 41
3
votes
0
answers
2k
views
Outlook.com rejects: 550 SC-001 (BAY004-MC5F13)
I am operating a cluster of 3 dedicated machines for a webapp, each of those uses sendmail as MTA. Hostnames are node1.domain.com node2.domain.com node3.domain.com
Unfortunatelly outlook.com rejects ...
- 2,202
3
votes
1
answer
427
views
Exchange 2010 is trying to relay messages for delivery
I am using Exchange 2010 on premises. I am in the process of setting up a SMTP proxy that will receive all messages coming into the office, log them, then forward them to my exchange server for local ...
- 99
3
votes
0
answers
420
views
How to identify the user/computer that is relaying spam through a mail server?
For the past couple of days, at certain intervals, a huge load of email is dumped on my Exchange 2003 server and relayed out until it gets blacklisted everywhere.
Nothing like this happened for many ...
- 199