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3
votes
1answer
38 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 ...
1
vote
1answer
177 views

Is it possible to use CDO libraries (classic ASP) to send mail to Office 365 / Exchange Online?

I'm working on a migration to Office 365 / Exchange Online for a SMB company which until now has been running a local Exchange 2010 server; we're talking about ~25 mailboxes here. However, there's a ...
1
vote
1answer
196 views

postfix/dovecot - how to view smtp auth user in log files?

I am using postfix with dovecot and virtual users on a centos 6 system. I had a rush of spam recently, with tons of packs of 50 recipients delivered from an unknown account. The current logging (...
0
votes
1answer
37 views

How can I easily setup a SMTP reverse proxy from EC2 to SES?

How can I easily setup a SMTP reverse proxy from EC2 to SES without revealing SES the original SMTP Client IP?
0
votes
1answer
52 views

Javamail using Exchange as relay

I have to fix an "unable to relay". The java server has to send emails to the internet. The java server and the exchange server are in the same network. How I configure properly a receive connector in ...
0
votes
1answer
63 views

503 AUTH command used when not advertised exim4 - Outlook

I do keep on getting this error: 503 AUTH command used when not advertised I have seen this question : exim configuration: 503 AUTH command used when not advertised The difference is that i do not ...
0
votes
1answer
792 views

Email server fails to authenticate my client, returns “use web to login”

I'm trying to send a mail message using System.Net.Mail.SmtpClient via Yandex Mail and have the following transcript: S: 220 smtp17.mail.yandex.net ESMTP (Want to use Yandex.Mail for your domain? ...
0
votes
1answer
78 views

Spamming from Exchange 2003

I am apparently spamming the world (about 1000 a day) but cannot figure out how. Mxtoolbox does not list me as an open relay and I have disabled all relays that I can find. I have run every virus ...
-1
votes
1answer
497 views

How to do Postfix accept outgoing mail from another internal servers

I have a MTA with Postfix SSL/TLS configured and sending messages perfectly fine. In the same internal network, I have other servers that I want to send mail through this MTA. In main.cf variable '...
1
vote
0answers
23 views

Sendmail will not accept user ID / pass in SMTPAUTH

To cut down on the possibility of spam, I'm trying to set up SMTPAUTH on my Sendmail (8.14.4 on Mint MATE 17.1 x64) installation. Users can retrieve mail from the server with IMAP or POP (using ...
1
vote
0answers
63 views

Postfix permit localhost use plain login

I have postfix 2.11 setup on Debian jessie with Dovecot SASL and I require encrypted login mechanism to send mail via smtp. For this purpose in the main.cf I've smtpd_tls_auth_only = yes option set. I'...
1
vote
0answers
1k views

530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is ...
0
votes
0answers
94 views

How to allow authenticated User to relay on a Cisco ESA C170 (iron port)

I'am trying to configure my ESA C170 and all works as expected. But now I want to add support for relay function for authed external user. I add a SMTP Auth Profile against LDAP that works. Next Step ...
0
votes
0answers
27 views

535 error from gsmtp

I am using Erlang and its esmtp library to send emails from my application. It used to work OK and still works fine on the development machine. Unfortunately several weeks ago it stopped working on ...
0
votes
0answers
46 views

failed/unauthorized logins attempts via SMTP/IMAP

My server host sent me this message: 80 failed/unauthorized logins attempts via SMTP/IMAP We have detected abuse from the IP address xx.xxx.xx.xx, which according to a whois lookup is on ...