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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227 views

New CentOS 7 server - Sending mail from a PHP application

Apologies for the newbie question but i'm hoping someone can provide me with some help/steps. I am in the process of migrating a website from a managed shared hosting account online to a new CentOS 7 ...
0
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0answers
30 views

Updated hostname of server but old hostname still appearing appearing in Postfix logs?

Been having some trouble with emails bouncing when being sent to certain addresses from our CentOS 6.4 Media Temple DV server. I am no expert but after checking the mail logs it appeared that they ...
-2
votes
1answer
19 views

TLS for outgoing mail (following ISPmail) not working

I built my mailserver on a vserver after the ISPmail tutorial (https://workaround.org/ispmail/wheezy) (which is awesome). The only remaining problem is that it does not seem to use TLS with outgoing ...
-1
votes
1answer
40 views

How to process sendmail queue when 25 port is blocked? [closed]

I have one VPS which forwards e-mails from one mailbox to another. Unfortunately ISP have blocked 25 port last week and since then I can't receive any e-mail from it. According to mailq there are ...
0
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0answers
37 views

Mail server still BLACKLISTED after fix the issue

I have an Exchange 2007. CBL has blacklisted me because: This IP address is HELO'ing as "localhost.localdomain". If you test and helos properly means something OTHER than your mail server ...
1
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1answer
234 views

How to unassign self-signed cert from SMTP on Exchange 2010?

We have a GoDaddy wildcard certificate that we have installed into Exchange 2010 and is successfully used on IIS connections for OWA. We have assigned this certificate to the SMTP Service as well as ...
0
votes
1answer
57 views

SMTP-Mailing with PHP works - but not with PHP-Cli

I mentioned a strange behavior on my webpage: If I try to use Joomla to send Mails via SMTP it works fine; no problem at all. But: If I try to use a PHP-CLI-Script the action fails (same source ...
3
votes
2answers
199 views

Is setting up my own SMTP server to send email a waste of time with regards to deliverability?

I have a dedicated host serving a few domains I manage. I host my own email and IMAP server. The server is at buildoneforme.com with IP address 144.76.81.247. I think reverse DNS is working: $ host ...
2
votes
2answers
39 views

Where do these “single-dot” smtp connection failures come from?

I'm running a mailserver based on postfix. There are a lot of connection failures like this: Transcript of session follows. Out: 220 hostname.tld ESMTP Postfix In: . Out: 502 5.5.2 Error: command ...
0
votes
1answer
20 views

Mailman not integrating with postfix properly

I installed postfix on my local machine and able to send mails to local users i.e. shivams in my case which is username of the account. Also i am able to send mail outside of my machine for ex. ...
2
votes
1answer
58 views

Postfix: Set custom SMTP Banner based on address used to access server

The Postfix parameter smtpd_banner sets the text of a server's SMTP greeting banner. The default setting is: smtpd_banner = $myhostname ESMTP $mail_name My mail server has several unique IP ...
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1answer
41 views

Outbound emails not being signed with DKIM using Postfix on Centos

I have been using phpmailer for my emails and i had dkim working correctly with this. I have a key mail._domainkey.domain.com. I have validated my past emails with http://www.mail-tester.com/ and i ...
0
votes
1answer
71 views

What directory permissions does Postfix require to copy mail into a users maildir folder?

I have postfix setup and running. Everything seems good other than the directory permission errors. In the past i accidentally ran chown -R apache / which as you can imagine broke a crazy amount of ...
0
votes
1answer
88 views

Google Apps with internally/customer hosted SMTP relay - (not using smtp-relay.gmail.com service)

We are using Google Apps for our email service, and send a bulk of around 15k emails a day from our internal relay server (its outbound only, no open-relay) to customers. Recently, we ended up ...
4
votes
1answer
173 views

Postfix reject_unknown_reverse_client_hostname: replace default unknown_client_reject_code (450) to 550. Why/When I should not?

In the daily battle against SPAM, there have been several times when I've been tempted to heavily enforce DNS requirements from clients connecting from the wild Internet. In detail, I would have ...
0
votes
1answer
200 views

What's the difference between postfix/smtp and postfix/smtpd

A bit confused when reading through the logs of my smtp/mail server, I'm turning this questions to you guys. In the maillog files I'm seeing entries for postfix/smtp as well as postfix/smtpd. I can ...
0
votes
1answer
56 views

possible for all outbound smtp to run through proxy?

Is it possible to setup my centos 6.5 so all outgoing port 25 is run through a proxy. I have incoming smtp/port 25 coming to my mail server through HAproxy but i would like the outgoing to do the same ...
-1
votes
1answer
42 views

Forwarding emails to external domains - aliases vs mda sieve script?

There are 2 points in the flow of a incoming email where emails can be forwarded: As soon as aliases are expanded (setting the target email as alias target) As soon as mails are handed over to the ...
2
votes
1answer
435 views

Why would an SMTP client send a RSET (Reset) command?

I’m trying to understand how exactly an email is processed by Postfix – and some of the finer details of SMTP mail transactions. My short-term goal is to debug a proprietary (binary, closed source) ...
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0answers
39 views

IIS 6 SMTP service stops working after server restart

I'm currently wrestling with IIS6 SMTP service not working properly when the server is restarted. This has only just started happening in the last month and struggling to pin point the issue. I ...
1
vote
1answer
34 views

SMTP server for testing purposes with a few specific requirements [closed]

As our company started doing development work on their on-line product they used a gmail address for testing purposes, using '+' notation to deliver all test e-mails to a single mailbox. Over time ...
0
votes
2answers
71 views

Postfix spam abuse [duplicate]

I have a terrible problem, my joomla website is being abused to massively send spam. I have no clue on what is actually happening, but my postfix mail queue is constantly filled with thousands of spam ...
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0answers
109 views

CentOS Postfix/Dovecot status deferred conversation with 127.0.0.1[127.0.0.1] timed out while receiving the initial server greeting

Linux Kernel: Linux 2.6.32-504.16.2.el6.i686 on i686 RAM: 6GB OS: CentOS 6.6 Postfix 2.6.6 Dovecot 2.0.9 Relay Host Verizon Stunnel through 127.0.0.1:2525 Webmin 1.750 Virtualmin 4.17.gpl Multiple ...
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votes
2answers
73 views

How to install a Mail Server on your Windows Server [closed]

I am looking to move my hosted site + email onto my Azure VPS (Windows Server 2012). I can migrate the site successfully using the @ A Name Record, but how would I go about the email? Do I need to ...
0
votes
1answer
27 views

Exchange 2007 - SMTP Traffic

I've done a check of what SMTP trafic is being routed through a 2007 mail server, which we are decommisioning. It looks like all printers are using the mail server for smtp relay, would it be ...
0
votes
1answer
52 views

Postfix + php translating email addresses sent to local domains to something@localhost.localdomain [closed]

My first question here, if I don't provide sufficient info straight away, please take it easy on me with the downvotes ;-) I'm running a VPS hosted by afterburst.com with OpenVZ I installed and ...
0
votes
2answers
63 views

Mail delivered via server IP not associated with sender

When a sunbirdinc.com account sends an email to an earthlink.net address, the following message bounces back: ToSomeone@earthlink.net host mx1.earthlink.net [209.86.93.226] SMTP error from ...
0
votes
2answers
2k views

Relay access denied (in reply to RCPT TO command) Postfix Issue

I am trying to configure my server for email taking reference form this link: SMTP Relaying Outgoing Mail in Postfix - using Webmin. I used Mandrill smtp server in my case. I have also configured a ...
1
vote
1answer
199 views

Postfix mandatory smtp/smtpd vs “not mandatory” difference and configuration

Three questions: Correct me if I'm wrong: smtpd_tls_mandatory_ciphers => settings for incoming mandatory TLS encryption smtpd_tls_ciphers => settings for incoming opportunistic TLS encryption ...
0
votes
2answers
206 views

SMTP Reverse DNS Mismatch Reverse DNS does not match SMTP Banner

I wonder if you could help me? I have set rDNS to mail.simplyislam.biz for IP 178.32.48.104 with my hosting server and also in DNS control panel. However, I am still failing this test: ...
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votes
3answers
73 views

How to force Postfix SMTP to use AUTH (SASL?) and reject anonymous connections? [closed]

The following snippet has been added to the main.cf file of postfix: smtpd_sasl_auth_enable = yes smtpd_sasl_security_options = noanonymous smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd ...
1
vote
1answer
26 views

Exchange 2003 restrict anonymous smtp access only

On exchange 2003 I want to listen for smtp on port 25 only so that * anonymous login is only allowed from certain internal IPs * authenticated login is allowed from everywhere I can't see how to do ...
2
votes
1answer
52 views

SMTP service detection

I have some basic questions regarding SMTP connections, particularly for Postfix but would appreciate advice for MS Exchange too: When a single relay for a given remote domain becomes unavailable, ...
0
votes
1answer
32 views

Windows Server 2008 IIS6 SMTP With more than 1 FQDN

I've tried researching this one, but I'm not having much luck on google. What I have is a Windows Server 08 R2 with IIS6 SMTP installed and configured / working 100% perfectly for Domain A. Domain ...
0
votes
0answers
13 views

FreeBSD pf does not allow inbound smtp [duplicate]

I'm trying to figure out why the following simple pf config allows inbound SSH but not smtp (tcp 25). I'm running FreeBSD 10.1-RELEASE-p9, and the SMTP server is postfix 2.11.4. # ...
0
votes
0answers
18 views

Server apparently being exploited to send emails [duplicate]

I have a dedicated server which runs a forum, a couple of wordpress installations and a prestashop ecommerce platform. My datacentre keeps cutting my connection, stating that my server is sending out ...
0
votes
0answers
553 views

php mailer SMTP ERROR: Failed to connect to server: Permission denied (13)

I fixed this error on a dedicated cPanel server by allowing outgoing connections on port 465 on iptables. I'm trying on AWS now, but I can't figure out what's wrong. I stopped SELinux and iptables; ...
0
votes
2answers
519 views

PostFix 550 5.1.1 Recipient not found from external email

This is a new installation. PostFix reports "550 5.1.1" "Recipient not found.", when users exist. User can send email out everywhere. Users can send email to each other through localhost. All ...
3
votes
3answers
285 views

Reject incoming emails that use your own domain as sender

It would be nice to reject incoming emails which use one of my virtual domains as sender address while not being a legitimate user of mine. I know that I can reject incoming emails which use an ...
3
votes
1answer
186 views

postfix: forward all mail except local user ones

I have a website on a server with a postfix mail server to send the site's emails. Let's say the domain is example.com. The site can send mails to mailboxes of his own domain (like ...
1
vote
0answers
173 views

SMTP error : Remote host said: 550 5.7.1 At least one FROM header address not allowed to send mail from IP ADDRESS

We are developing an email sending app, and we allow our users to specify the From: header their emails will be sent from. Let's say our domain is mydomain.com and our client domain is ...
2
votes
1answer
110 views

Postfix : Conditional Header Checks

Here is my SMTP situation. Mail flow is tagged by an online relay provider (!!SPAM!!, !!BULK!!, etc) Mail flow is received by an internal postfix. Transport is configured to relay to our internal ...
0
votes
1answer
162 views

Can't send email on Windows Server 2008 with Mailenable

I've got a VPS running on Windows Server 2008 and I'm using Mailenable as an Email Server for POP3 and SMTP. I've had the VPS since January 2015, its my first time configuring a server by myself, but ...
4
votes
2answers
214 views

Postfix SMTP Relay Configuration Error

For the last day I was searching for solutions for this problem: My postfix(+dovecot) configuration is fully able to receive e-mails and to serve them via IMAP but it fails at accepting them via SMTP ...
3
votes
1answer
94 views

How to reinject scanned mail into the queue using sendmail

I would like to pass incoming mail using virtual_transport to a transport spamassassin (main.cf: virtual_transport=spamassassin) and then reinject the scanned mail into postfix using sendmail. The ...
1
vote
2answers
179 views

How do I setup a server to send emails after starting (i.e. not meaning as an email server)?

Windows Server 2012 R2 w/ GUI, UPS system I am setting up my first server. It is a Hyper-V host that will host multiple VM servers. The system is on a UPS. When the UPS detects an AC power ...
3
votes
1answer
48 views

Routing SMTP Connections to Different IP Sets with IPTables

I'm trying to set up two different IPs for SMTP that each get routed to two different sets of IPs, with no IPs shared between the two sets. I'm trying this, but it mixes the two sets of IPs so that ...
1
vote
2answers
55 views

Wildcard MX record support?

Let's say I want to start a service where customers get their own subdomain on my domain for email addresses only. I have an A record for mydomain.com and a CNAME for www.mydomain.com If I add a ...
0
votes
1answer
25 views

Exchange 2013 return message for old addresses

In my company there are two kind of smtp address in exchange 2013 recipients: j.deere@mycompany.com (old) john.deere@mycompany.com (new) Now I would like to remove all old addresses (j.deere) but I ...
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votes
1answer
137 views

My server mail going junk in hotmail and yahoo [duplicate]

All my server mails going to spam in hotmail and yahoo. Here is my full mail source. Can any one please help me to sort out this issue ? ...