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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78 views

Exim4 require TLS for all hosts but localhost

As my webmailer does not support STARTTLS and I want to enable relaying for everyone at localhost, I would like to have Exim advertise AUTH PLAIN and LOGIN only without TLS if the connection was ...
-1
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1answer
115 views

Postfix sends as hostname.domain.com instead of domain.com

I've been trying to set up a debian mail server running postfix, but when I try to send mail via mail example@outlook.com the recipient sees the sender as hostname.domain.com. The hostname it sends ...
-1
votes
1answer
77 views

Postfix cannot send to external domains

I set up my Postfix with a sasl link to a Dovecot user / domain database. Postfix is giving the following error message when trying to send mail to external recipients (internal are fine): Server ...
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votes
1answer
168 views

How to setup SMTP server to allow mailing to any recipient? [closed]

I have a windows server, acting as a web server and mail server. For the mailserver I use hmailserver and works fine recieving emails but not so good sending emails because I cannot setup reverse DNS ...
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1answer
89 views

Is there a way to send email using port 465 only? [closed]

I'm trying to send email via port 465 since my ISP has blocked the port 25. openssl s_client -crlf -connect example.com:465 EHLO example.com AUTH LOGIN sdgfsdgfdgdfg dfgdfgdf mail from: ...
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1answer
87 views

Postfix virtual mailbox base, uid, gid — good user and group choice?

I often see tutorials for setting up Postfix with the virtual mailbox delivery agent on Linux that instruct to create a new disabled-login user and group to own virtual mailboxes in ...
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1answer
61 views

Trac notifications (smtp) and Postfix

I've two separate ubuntu 12.04 servers. Runs Trac (homeserver/Dyndns) Runs postfix (VPS/staticIP) I configured trac to use TLS and connect to postfix server. Trac config: admit_domains = ...
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1answer
37 views

At what point should I dedicate a server for SMTP [closed]

I currently have a 2GB RAM windows server 2012 which is has IIS and SMTP installed on there. Now I seen alot of people leave SMTP out on the webserver and buy a server just dedicated to handle the ...
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1answer
198 views

Postfix still complains that “certificate verification failed” even when “smtp_tls_security_level = fingerprint”

I'm attempting to use Postfix (version 2.6.6 on RHEL6) to connect to and send mail via a mail relay on our internal network. I want to connect with STARTTLS on port 25 (port 465 is not available on ...
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1answer
47 views

Swiftmail cannot use sendmail/postfix

When I try to run some Kohana swiftmailer I get the following error in maillog: Jul 23 17:18:37 ads postfix/sendmail[5818]: fatal: execv /usr/libexec/postfix/smtpd: Permission denied The output of ...
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1answer
241 views

exim4 - Why is rate limiting outbound mail to a smarthost only working with acl_not_smtp?

In an effort to rate limit outgoing emails per recipient (all emails are sent by the same user), I've been doing some testing in a very simple environment: ...
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1answer
94 views

syslog-ng 3.5 flush_lines not working with smtp

What I want: automatic emails every time someone successfully logs into my Ubuntu 14.04 LTS server. /var/log/auth.log gets 2 lines written to it every time I login. Example: Jul 22 13:55:49 server ...
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1answer
27 views

monitoring availability of publicly accessible distribution lists

I have an unusual request from management: to set up monitoring of public-facing email addresses that resolve to distribution lists(groups). We are using Exchange 2010 to host these lists/groups. I ...
-1
votes
1answer
129 views

How to setup intermediate SMTP mail server / relay to filter outgoing emails

I want to block all outgoing emails except to few whitelisted domains. what are the best ways to go about it? Can I put an intermediate Intranet server which will do filtering based on whitelist and ...
1
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1answer
275 views

Postfix 5.7.1 Unable to relay [deliver internal mail directly]

I have the following scenario: serverA = RHEL5 using Sendmail serverB = RHEL6 using Postfix serverC = RHEL6 using Postfix gwsmtp = relayhost example.com = domain name As we are migrating from ...
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0answers
82 views

Server sometimes doesn't receives e-mail, with error 451

One of my customers tried to send me an e-mail with his e-mail address that I didn't received. He received a Delivery Status Notification (Delay). I only received the message 2 days later In the ...
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votes
2answers
141 views

Mail delivery to not-yet-migrated accounts in O365 staged migration

I'm about 10% through a staged migration from Exchange 2003 on-prem to Office 365's Exchange Online. The question I have is how do the migrated users that are now successfully using Exchange Online ...
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0answers
57 views

hotmail isn't receiving mail from my server

Hotmail is block all mails (not send to Junk, it really block!) send from my VPS server (even if I send directly from roundcube, for instance). I checked all configs and seems that all is ok. Works to ...
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1answer
38 views

Postfix relaying to local instead of relayhost

I am trying a simple postfix relay of emails via an SMTP server. But I see from the logs that the mails are relayed to local and not to the relay host. The main.cf configurations are below, ...
1
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1answer
108 views

Postfix Outgoing Mail Suddenly Being Deferred

I am having trouble sending mail with postfix after changing the "Format for usernames that include domain" under the "Mail For Domain" template. Basically I had everything working but then changed ...
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1answer
39 views

Does IIS 6 Virtual SMTP Server support UTF/Unicode Subject Lines

I have a Windows 2008 R2 server running IIS 7.5 hosting a bunch of websites. These websites relay email through the IIS 6 Manager's Virtual SMTP Server. I'm trying to verify whether or not this ...
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1answer
197 views

My server does not listen to port 25, even though iptables allows smtp traffic [closed]

My public server accepts traffic and relays them to other machines on the network with iptables PREROUTING rules. I recently added a mail server at 192.168.1.10 and made its iptables rules to accept ...
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2answers
69 views

Simplest Way to Setup Email for Various Domains

I'm beginning to use Mandrill to send out transactional emails from my various domains. Now what I'd like is a way to receive these emails simply w/out setting up a mail server on my linux boxes. I'm ...
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2answers
140 views

Postfix Domain Whitelisting in Combination with Sender Authentication

I'd like to whitelist several domains in my Postfix configuration in such a way that all e-mails from those domains are accepted as long as they're properly authenticated using SPF and/or DKIM, should ...
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1answer
83 views

SMTP retry interval - Lotus Domino

Our ISP only accepts 5 emails per transmission. If I do a manual send (route *), then I usually get the error: 57 Retry( 2) SMTP [$Retry MY_ISP.COM] (Push) Last error: 421 4.4.2 Message submission ...
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2answers
729 views

SMTP don't work when try to send mail from mail clinet

Mail server works fine when send mail from server, but when I use some mail client it not work. I found this in logs: Jul 12 19:45:04 tvsite postfix/smtpd[3356]: warning: hostname adsl-bb29-l44 does ...
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1answer
208 views

EXIM - 550 Cannot receive from specified address - Sendgrid

We're having some intermediate issues with exim where some emails go through and then others get the 550 Cannot receive from specified address Error. This is the guide we used to setup EXIM: ...
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2answers
108 views

Remote IP and SMTP Proxy

Is it possible to proxy emails - with postfix for example - transparently so the backend mail server will get the last SMTP server IP address (rbl purpose) and not the Proxy IP address? If it is ...
4
votes
3answers
102 views

Will mailing lists “break” if SPF is too restrictive?

I have recently configured my own mail server (Linux-based postfix + dovecot scenario). This is just for personal use - I have no bulk mail going out, no automatically generated mail outbound from the ...
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2answers
110 views

View realtime list of connections to Postfix

I am running Postfix on a linux box with a couple hundred local users with mailboxes. Is there a way to monitor all incoming connections (SMTP) to the Postfix service? I.e. a live stream of "IP ...
0
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1answer
50 views

smtpdiag tool lists wrong mail servers

I have a weird issue on a server. When i run the smtpdiag tool, it lists the old mail server settings (with mx servers being website.com & mx01.1and1.com). here're the results Checking MX servers ...
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4answers
929 views

Postfix setup on AWS EC2 using SMTP relay

On ec2 instance, the IP is dynamic, and if I want to use third party SMTP gateway such as sendgrid, what is the suggested values of the following fields? myorigin myhostname mydestination Assume ...
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1answer
512 views

RoundCube SSL SMTP Failure

I've set up a roundcube installation on my website that works great when using SSL for IMAP and non-ssl for smtp. The only problem is this: when I switch to using ssl://smtp.[mydomain].com for my ...
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2answers
139 views

What should I set in postfix's myhostname / mydestination?

I am using Ubuntu, on a web server need to send out email (via sendgrid), this server never receive any external email, and I've the following hostname settings /etc/hostname = example /etc/hosts = ...
0
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1answer
19 views

Regarding Remote SMTP

I am trying to send mail using remote Gmail SMTP from my joomla website. Do I still need to install & configure MTA such such postfix for connecting to remote Gmail Servers or the joomla would ...
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0answers
188 views

Exim/Cpanel Email Headers

We have been trying to figure this out for a few days now and have been all over this board as well as a few others, and this refers to Received From and X-AntiAbuse: Primary Hostname headers. We are ...
0
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1answer
54 views

Send email from main domain using exim4

I've installed exim4 on my server to send email for server messages, registration messages, lost password messages etc. My server's FQDN/rDNS is mail.example.com, which I also entered during the ...
2
votes
1answer
92 views

How can I enforce TLS in sendmail when I don't necessarily know the hostname of the downstream MTA (only IPs)? [e.g. by recipients' domain]

I'm running SendMail 8.14 and have some custom static routes for sending to certain domains. These domains are "internal" but not managed directly by me. Here's an example of ...
0
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1answer
68 views

how to provide username and password for ansible mail module

How to provide username and password of email account while using ansible mail module. I'm using gmail smtp server. In documentation of mail module nothing is mentioned about it. I also came across ...
1
vote
1answer
35 views

SecAst: Configuring Email Alerts for Google Apps Account

Requesting assistance with configuring SecAst email alerts to work with Google Apps hosted account (posting here as per request by Generation D)... We have SecAst installed on a system with a new ...
1
vote
1answer
42 views

What are some useful email reports to monitor in an SMTP/email environment?

It's possible to generate dozens of email reports in a given SMTP environment, and I'm interested in learning what reports are common in large installations and how they are used. Examples: ...
4
votes
3answers
233 views

How to limit amount of email sent by postfix to certain domains and control it by using mail header?

Goal I'm looking for a solution to limit rate of e-mails sent to specific e-mail operator (several Top-Level domains, all of them I know) on hourly basis. I also need some way to control the rate on ...
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0answers
84 views

Exchange 2010 ā€“ Multiple Smart Hosts

A client has Exchange 2010 which, up to now, had a single internet connection. They were sending email via a smart host run by their ISP. It was working OK. We have put in a second internet ...
0
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5answers
60 views

Do most SMTP servers support SSL? [closed]

I'm working on an application that has to be able to send out emails with potentially sensitive information. I was wondering if there's any data on what SMTP servers are typically used in a corporate ...
0
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1answer
388 views

Postfix allow SASL-authenticated users to send from any IP address

I understand that I need SMTP on port 25 to receive email, but I do not want this to be a relay port. Instead I would port 587 to be used for registered (SASL-authenticated) users to relay email from ...
0
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1answer
205 views

Incoming hotmail connections timing out with TLS enabled

Okay, this has me completely baffled. I have tried many things to fix this but I'm at my wits end. At the start of June, the server which I maintain suddenly decided to stop accepting incoming TLS ...
0
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1answer
50 views

Postfix Regex Alias with Text Substitution

I'm migrating from an older email structure ([first letter of first name].[last name]@company.com) to [first letter of first name][last name]@company.com. To ensure that mail sent to older addresses ...
0
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1answer
80 views

How to know if iptables rules work? [closed]

I'm implementing a IP Rotation for my SMTP Server using iptables, how would I know it work? This is the rule I use. iptables -t nat -I POSTROUTING -m state --state NEW -p tcp --dport 80 -o eth0 -m ...
0
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1answer
120 views

Configuring SMTPS in Virtualmin

I'm attempting to configure SMTPS in Virtualmin and am running into a roadblock. I followed the instructions here without a problem but when I do the autoconfigure in Thunderbird it still says that ...
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0answers
384 views

Zimbra SMTP Reverse DNS Mismatch

I have a Zimbra email server. sending and receiving is fine, however When I use online tools to check that things are configured properly, I'm being told my reverse DNS SMTP Banner is wrong. ---- ...