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

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
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3answers
907 views

Domino always server fails to send SMTP email at first attempt

In our logs, we find the below: Router: No messages transferred to fakedomain.com (host mx.fakedomain.com) via SMTP: The server is not responding. The server may be down or you may be experiencing ...
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2answers
27 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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1answer
7 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 ...
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2answers
54 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 ...
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1answer
33 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 ...
5
votes
3answers
12k views

Exchange Connector Won't Send to External Domains

I'm a developer trying to get my .Net application to send emails out through our Exchange server. I'm not an Exchange expert so I'll qualify that up front!! We've set up a receive Connector in ...
1
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1answer
3k views

Exchange 2010 SP3: 4.3.1 Insufficient system resources

We have Office 365 with a hybrid deployment. Our on-premise server is relaying email directly out to the web (not via EOP). domain-a.com is an accepted domain on our on-premise server; domain-b.com is ...
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4answers
5k views

Postfix: warning: connect to 127.0.0.1:10023: Connection refused, not receiving mail from outside domains

I've had a Postfix server running for a very short amount of time, and it worked, but I had to restart the server today, and I'm no longer receiving e-mails from external sources: Jan 23 01:34:44 ...
0
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1answer
39 views

IronPort, DLP and SMTP integration

We have configured IronPort, DLP and SMTP in my organization. Now I am getting an error message: statin - : TLS handshake could not be completed". Questions: Can anyone please tell me whether ...
0
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1answer
893 views

Configure Citadel to be Used For sending email using smtp

Sorry for this foolish question, but I have less knowldge about servers. So bear with me! I have configured Citadel as directed in linode documentation and can login using the front-end for accessing ...
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1answer
341 views

Dual delivery Google Apps and Postifx (server reject mail from my domain on google)

This is the scenario: I have a server with Postfix and some domains, and now, one of this domains want to use Gmail Google Apps only in a couple of accounts. The end-user configure the domain with ...
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1answer
851 views

Postfix enable sending to any domain in the Internet with authentication but no SSL

When I try to send a mail by SMTP and Postfix I got a error "5.7.1 unable to relay". After lot of config changing it worked for me to send email to the same domain as server (to other accounts on ...
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votes
0answers
13 views

configure sendmail to discard inbound mail sent in error

Management has asked that I set up a sendmail rule to not respond to internet mail sent in error. I think this can be done through ruleset hooks, where an address resolving to $#error can be routed ...
2
votes
2answers
3k views

Postfix stop outgoing delivery but accept all incoming

I'm doing development for a webapp that sends emails out to users. I've typically used Argosoft Mail Server (Freeware) in a windows environment as an SMTP server in which I've enabled relay but ...
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vote
2answers
43 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 ...
3
votes
8answers
15k views

What are the possible causes of this error: “Unable to > connect to ssl://smtp.gmail.com:465”? [closed]

I'm getting this error on my local machine when sending emails using (gmail's smtp + PHPMailer + CodeIgniter), which I wasn't getting on our previous office (we had to move offices). Severity: ...
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votes
3answers
31 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 ...
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1answer
27 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, ...
-1
votes
0answers
15 views

Need help setting dynamic message-id in headers

I am using software to send newsletters to clients. The software is connected to an SMTP server, which is configured correctly. The issue is the email software I am using does not merge/transfer ...
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1answer
17 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 ...
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2answers
2k views

Google IP Address Ranges for incoming SMTP [duplicate]

Essentially I'm answering my own question here, but want to provide this info to anyone else who might need it. I need all the valid IP address ranges for Google Apps mail servers. I'm configuring a ...
4
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8answers
10k views

Emails are being rejected by some email providers

I have this asp.net application that sends out emails. The SMTP server is iis6. The emails are being sent on behalf of our application users and they have different domain names. Most of the email ...
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0answers
11 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 ...
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0answers
232 views

Collectd notify_email Plugin Not Working On Ubuntu 14.04

I'm attempting to set up e-mail notifications using collectd and the threshold / notify_email plugins. I'm running Ubuntu 14.04 LTS, attempting to relay e-mails through Amazon SES. Relevant package ...
0
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0answers
10 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. # ...
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votes
1answer
997 views

Windows Server 2012 R2 IIS SMTP Server Will Not Send Emails

I have an existing SMTP server on our network that is used to send emails from a variety of printers, applications, etc... I have installed the IIS SMTP Server on a new Windows Server 2012 R2 server ...
2
votes
1answer
51 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
226 views

Configuring postfix to use TLS for a particular server?

Running kubuntu 10.04 on my host, let's call it alpha. I've got postfix as my system MTA. I've got crons running on alpha that need to send email to a remote host, let's call it mailhost. I cannot ...
0
votes
1answer
45 views

Sending email from various domains

We are building hosted software service that is used by multiple customers. These customers want to communicate with their customers (end customer). So, today we send it from our domain: example.com ...
1
vote
1answer
507 views

Ruby on Rails application throws SMTP Authentication Error

I'm developing a Rails app which when I run it locally, it's able to send emails through a gmail account via smtp. When I moved it to my server, it comes up with the following error for example when ...
1
vote
1answer
67 views

google apps mail error

In recent months, we have big problems when we send email on our own mailing list (for safety, I'll call our domain name example.com) staff@toto.com. All users receive this kind of mail back from the ...
1
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1answer
51 views

OpenVZ - SMTP - telnet - Connection timed out

I have problem with SMTP in my OpenVZ container. I've created OpenVZ container by Proxmox on dedicated server in OVH. This container will be as mail server. So I create on "mother-server" rules to ...
0
votes
2answers
55 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 ...
1
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2answers
159 views

Can't communicate with SMTP server from particular machine

Here is the situation: When I run the following on my local machine, the mail server responds: $ telnet mail.server.com 2525 Trying <mail.server.com IP>... Connected to mail.server.com. ...
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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 ...
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votes
1answer
205 views

Why blocks gmail my postfix relay? [closed]

Here is partial postfix config: relayhost = [smtp.gmail.com]:587 smtp_sasl_auth_enable = yes smtp_sasl_password_maps = hash:/etc/postfix/sasl_passwd smtp_sasl_security_options = noanonymous ...
0
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0answers
49 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; ...
3
votes
6answers
9k views

How can I set up sendmail to forward all mail to an external MTA?

We have multiple applications that currently talk SMTP to an external MTA. The emails have arbitrary destination domains (they're emails to be sent to our users), but all from the same internal domain ...
3
votes
3answers
69 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 ...
0
votes
1answer
911 views

Exchange 2010 delivery to postmaster 550 5.1.1 User unknown

Exchange 2010 has a distribution group setup called postmaster and the Email addresses associated with it are postmaster@example.com, postmaster@example.net etc Internal emails sent to postmaster ...
2
votes
2answers
76 views

How to route select e-mails from Office 365 to another SMTP Server

I have set up an SAP system to act as an SMTP server on port 25000. The company uses Office 365 as its email provider. Is it possible to route/forward e-mails that are delivered to a specific e-mail ...
3
votes
1answer
40 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 ...
3
votes
1answer
106 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
50 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 ...
0
votes
1answer
67 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
94 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 ...
-1
votes
0answers
66 views

Differences between Exchange's “default” SMTP certificate and others enabled for SMTP?

I know that: You can enable the SMTP service for multiple certificates in Exchange The last certificate enabled for SMTP becomes the "default SMTP certificate" My question: What are the ...
1
vote
2answers
52 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
22 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 ...