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.

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4
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2answers
132 views

How to remove the SMTP address for a secondary domain from all Exchange mailboxes?

I have an Exchange server which used to manage multiple SMTP domains; now it only has to manage one. I have already removed the secondary domain from all address policies; I need to remove all SMTP ...
0
votes
0answers
208 views

SMTP issue causing mail to not be forwarded?

When I send an email to something@mydomain.com, expecting it to be forwarded to myemail@gmail.com via the default address set up in cPanel, it just never arrives.. If I set up an email account in ...
-3
votes
1answer
61 views

How to configure sendmail to use different SMTP relay servers [closed]

How to configure sendmail to use different SMTP relay servers. For example: For all gmail.com recipients sendmail should use gmail SMTP server obviously with Gmail smtp auth. For all yahoo.com ...
0
votes
1answer
153 views

TLS connect failed: error:140943FC:SSL routines:SSL3_READ_BYTES:sslv3 alert bad record mac while sending mail via Qmail

I'm trying to send e-mail to one of the biggest polish hosting companies and their servers are refusing to receive it with message: TLS connect failed: error:140943FC:SSL ...
0
votes
1answer
37 views

amazon ec2 smtp ipv6

I have an Amazon EC2 instance. My postfix server sometimes tries to send outbound emails (web form etc) to ipv6 addresses. It fails and the emails go into the queue. Is there a way to prevent ...
0
votes
0answers
46 views

Postfix forward unknown email address to another server

I have a postfix setup with multiple domains, which is managing mailing lists for several domains. Previously, all of these domains actual email addresses have just been aliases to other email ...
2
votes
2answers
50 views

Move Maildir safely on running server

I want to move some Mailbox directories to a new disk while postfix and courier imap daemons are still running. The question is ¿what happens if a new mail is recieved into the Mailbox while moving ...
5
votes
1answer
183 views

saslauthd multi instance for postfix smtp authentication

I have mail server Postfix+Saslauth. I configure multiple instance for Postfix: postfix postfix-out and two instances for saslauth: saslauthd saslauthd-out Setting saslauthd is ...
1
vote
2answers
110 views

Iptables blocking smtp

Iptables is blocking outgoing and incomming smtp on my server, although I specified it not to. My policies are DROP everything except what's specified. Changing policies to ACCEPT everything "solves" ...
0
votes
3answers
61 views

SMTP sent E-mail not copied to Sent Folder [closed]

I discovered that some (few) providers don't copy into the Sent folder those E-mails which are sent from mail clients through SMTP. They only copy them to the sent folder if you send them from their ...
0
votes
1answer
75 views

SMTP routing with EDGE servers for Exchange 2010

I am trying to set up some EDGE servers for Exchange 2010 (SP3 UR2) but they are being a real pain. I have the following servers in my environment: CASHT1 – CAS array member – FQDN is ...
1
vote
0answers
17 views

Is it possible to prevent emails being sent from an address absent from the AD user's account?

I'm using Exchange Server 2003 on a Windows Server 2003 which is also a domain controller. If a client connects through SMTP using his AD username and password, he can send email from any email ...
0
votes
2answers
83 views

Why don’t SMTP servers just require all senders to be authenticated before accepting mail? [closed]

Why don’t SMTP servers just require all senders to be authenticated before accepting mail?
0
votes
1answer
149 views

Postfix and saslauthd on Debian Wheezy not working after upgrade

Since upgrading to Wheezy I've been unable to send emails via my own mail server which used to have a functioning combination of Dovecot, saslauthd and postfix using pam. Now, running testsaslauthd ...
0
votes
1answer
447 views

Bounce message from gsmtp - weird message path

please consider the following email headers from a message that was returned to the original sender. The multipart bounce message also contains the transcript (clear text + HTML) of the correspondence ...
0
votes
0answers
24 views

How to configure SMTP to recognize a group

I'm using a windows server. I installed IIS SMPT server and using it. I have no problem when I send a mail to individual id. But I get an error when trying to send to a group. InternetAddress ...
0
votes
2answers
84 views

Issues using Amazon SES as relay with sendmail [530 Must issue a STARTTLS command first]

I'm trying to get our old rhel3 servers relaying out with sendmail 8.13.1 I have followed amazon's guide here: http://docs.aws.amazon.com/ses/latest/DeveloperGuide/sendmail.html But it seems the ...
6
votes
2answers
217 views

Display a TLS icon for messages that are TLS secured (Outlook)

One of my colleagues at a large financial institution has customised Lotus Notes to show a TLS icon for messages that are TLS secured. I'm interested in imitating this feature in Outlook, and believe ...
0
votes
0answers
20 views

centos rely access denied postfix send mail [duplicate]

I am trying to send mail from my centos using postfix configuration but getting error as 554 5.7.1 <dummy@gmail.com>: Relay access denied my postconf -n shows belog information ...
0
votes
1answer
51 views

Postfix: Possible to overwrite Return-Path via SMTP

I tried sending mails via SMTP and provied a Return-Path. Postfix seems to override my values with the "From"-Header. When im sending Mails via PHP, I am able to set the Return-Path Header with the ...
0
votes
0answers
28 views

Mail server in the middle responsible for translating from one domain to another

The title is a little confusing. We have an internal mail server that can be used to send mail. This internal mail server is only accessible from within our firewall unless we use the mail server's ...
0
votes
1answer
346 views

554 5.7.1 <mail_addr>: Relay access denied centos postfix

I have problem in send mail from postfix in centos I have following setup mail server postfix for sending mail but I am getting error. As in the link I tried following commands telnet localhost ...
1
vote
0answers
47 views

Custom Transport Agent: How do I collect NDRs and all other undeliverables in Exchange 2010 from the Postmaster?

I'm trying to collect all NDRs in a single mailbox for all invalid recipients, and anything that fails for any reason. I have a custom transport agent, that I've written myself that appears here: ...
0
votes
1answer
115 views

Cannot connect to remote port 465

I (actually, not me, rather a friend of mine) have a very strange issue. There's a VPS with CentOS, probably version 5: Linux [hostname] 2.6.18-274.7.1.el5xen #1 SMP Thu Oct 20 17:43:28 EDT 2011 i686 ...
2
votes
1answer
417 views

Cannot send email from EC2 instance on port 587

I have written a mail service for our flask application that uses Celery and RabbitMQ to send emails (using gmail). I have got the celery consumer and producer communicating okay but I cannot get to ...
4
votes
2answers
105 views

SMTP allows for multiple FROM addresses in the RFC. Was this ever useful, why does this exist?

SMTP allows for multiple FROM addresses on the body (not the envelope) according to the RFCs. Has this feature ever been used for a legitimate purpose? Is it safe to discard messages that have ...
0
votes
2answers
337 views

Postfix not sending/allowing receiving of messages after server (hardware) changed

We had na old notebook runing Ubuntu 12.04 working as a web/ftp/mail server and it worked but since the notebook was a notebook and pretty old and unreliable, a desktop was bought to replace it before ...
0
votes
1answer
47 views

IIS SMTP Server as MTA

I have domain xyz.com. I'm sending mail using MTA. through Symantec Cloud. My setup is as follows. [Symantec Cloud]<->[MTA]<->[Local Mail domain] all the mail out side the domain(xyz.com) goes ...
0
votes
0answers
18 views

Cannot write mail to Pickup directory on separate server

I'm trying to set up my .NET application to write SMTP messages to a pickup directory where they can be picked up by Exchange, rather than sending them directly to the Exchange SMTP server. However, ...
0
votes
1answer
68 views

PTR record not valid for all domains

We have an issue sending emails to certain domains, namely Time Warner and Cox. Last week, we decommissioned our Exchange 2003 server and now our Exchange 2010 server is doing all of the transport for ...
0
votes
1answer
245 views

Configuring external SMTP server on Azure VM - messages staying in queue

I have an external SMTP provider: auth.smtp.1and1.co.uk I am trying to send SQL Server Reporting Services emails via this on an Windows 2012 Azure VM. It is configured sufficiently correctly for ...
0
votes
0answers
104 views

'Cannot get iis pickup directory' in Windows Server 2012

Our system moved from Windows Server 2003(Enterprise SP2) & IIS 6. And new system is Windows Server 2012(Standard) and IIS 6(for smtp mail) & 8. I copied all of web application files and IIS ...
1
vote
1answer
67 views

Email server can send internal, but messages never arrive at external recipients

I'm running MailEnable on my server, and have been for many years. Recently we had an attack on our server, and I was able to close the hole. Since then, our mail server doesn't seem to be sending ...
3
votes
1answer
232 views

Force delivery retry without restarting the SMTP Service on Windows Server 2008 R2

I have a Windows Server 2008 R2 box hosting 3 virtual SMTP servers; vSMTP01, vSMTP02 and vSMTP03. The first two are configured to deliver all messages to dedicated smarthosts, while the last is set ...
0
votes
1answer
174 views

Configuring SPF, DKIM, Reverse DNS for VPS sending email through Google Apps SMTP servers

Today we realized that all of our emails being sent to email addresses of the type <username>@corporatedomain.com were getting rejected. I don't know who is hosting the email for ...
0
votes
0answers
74 views

IIS Virtual SMTP Service — Integrated Windows Authentication with Administrator

I'm playing around with the authentication features on an SMTP service running on Windows Server 2008 R2. I have coded up a quick email-sending console app in C#, with support for connecting by Basic ...
0
votes
2answers
143 views

Nagios - NagWin - Send notification with gmail

I would like to send Nagios notifications using my gmail account. I have already set up my hosts I want to monitor and services also. What is the most simple way to accomplish this using NagWin on a ...
-1
votes
2answers
120 views

How is incoming SMTP mail being delivered despite blocked port

I setup a MX mail server, everything works despite port 25 being blocked, I'm stumped as to why I am able to receive email with this setup, and what the consequences might be if I leave it this way. ...
0
votes
1answer
111 views

Postfix: mail going to spam [duplicate]

All emails I send from my new server go to spam in Gmail (and sometimes yahoo). I've never before sent out mass email or spam. What I've already done: Configured reverse DNS Enabled DKIM Verified ...
2
votes
2answers
61 views

How to get feedback from SMTP server, connecting to it from another server in the same network?

I have the following scenario: [HTTP Server]: process messages [SMTP Server]: only send messages [HTTP Server] === connect to ===>>> [SMTP Server] === sends message ===>>> [world] Ok, this is ...
0
votes
0answers
60 views

can't send with postfix but I can whith one user

I have a postfix and dovecot server but when i try to send an email i get an time -out. Im trying to send with the email pinda@treadity.com. A telnet session isn't helping much ether. I get a blank ...
0
votes
1answer
70 views

Exim + Spamassassin, automatically throttle spammy IP addresses

I am watching my email gateway blackhole spam messages using spamassassin - anything over a specific score. Right now, it is dropping around 3 per second. This is great, but I would prefer the spam ...
0
votes
0answers
19 views

email redirection service with reply path through local server

We need to keep a copy of all email conversations on our servers for regulatory compliance. We have contractors that (understandably) want to use their own email accounts We would like to setup a ...
1
vote
1answer
291 views

Can't connect to smtp (postfix, dovecot) after making a change and trying to change it back

I am using postfix and dovecot along with zpanel and I tried enabling SSL and then turned it off as I did not have SSL configured yet and I realized it was a bit stupid at the time. I am using CentOS ...
2
votes
1answer
31 views

Translating return receipts and postmaster messages

I was wondering if it is possible to translate postmaster message (return receipts, notifications, etc), or at least customize them. I ask this because my users (too) often call me in order to know ...
1
vote
2answers
58 views

Email verification with SMTP fails on local machine for certain domains

I want to verify whether mail box exists for a email with SMTP. I am able to do following things : Get MX records from domain Connect to host via SMTP Then I execute following commands : HELO ...
1
vote
1answer
204 views

Sending email with Python/Django through Microsoft Exchange (IMAP)

I have a Django web application which sends email through a standard SMTP, but I want it to use a mailbox from the corporate Exchange server. I would like the emails sent from the application to be ...
0
votes
0answers
84 views

How should I setup outgoing smtp for app emails on load balanced Windows servers

I've recently setup a small group of servers to host a couple dozen asp.net applications that send out emails for things like customer registrations, purchase receipts, error alerts, nightly batch ...
0
votes
1answer
172 views

SPF + ISP Smarthost, always untrusted?

One of the ways mail-servers protect themselves from spam is by SPF-records, a DNS look-up saying what ip-adresses are allowed to send mail from a given domain name. Another way the mail-servers use ...
0
votes
1answer
151 views

False positive rate of CBL

We've come into the office (30+ networked systems) this morning to find that our email server is blacklisted on the CBL for: This IP address is infected with, or is NATting for a machine infected ...