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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43 views

Setting up High Performance SMTP to send 300,000 mails daily [on hold]

I'm working on a project for a salesforce app for a 15 years old portal with a massive user base of around 3 Million subscribers and growing. The App sends our around 10,000 to 30,000 Transactional ...
1
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1answer
30 views

Allowing Postfix Relaying For Certain Hosts

I have Postfix setup in a test environment, segregated from our LAN, and relaying for hosts in the test environment. Originally, I had all outbound email funneling through procmail and into a single ...
0
votes
1answer
20 views

opendkim to sign all '*' users in a domain

How do you get opendkim to sign for all users in a domain? *@exmailer.com exmailmap in the signing table is not working for me. error: opendkim[1565]: 573D4A0D3D: no signing table match for ...
1
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1answer
17 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 ...
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votes
0answers
27 views

Email server not working [closed]

i'm trying to make an email server on my Windows Server Enterprise SP2. I have setup an smtp server on IIS 6. When i send an email to it, the sender get's this message: Your message could not be ...
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0answers
18 views

Postfix reject to deliver email through SMTP to any domain

My postfix server denied to send email to any domain except local one. Here is test result using telnet. telnet mail.emailhost.com 25 Trying 128.199.XXX.XXX... Connected to mail.emailhost. ...
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2answers
33 views

I am able to receive mails but unable to send via my SMTP server?

I have a shared hosting server from hostgator, in which I created an email 'support@mydomain.com'. Then I enabled both DKIM and SPF (as I read on a few threads that SPF should be enabled to ensure a ...
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1answer
33 views

Postfix POP3 NOQUEUE: reject: RCPT error

I am getting an NOQUEUE: reject: RCPT error when trying to send mail via POP3 and Postfix (note: IMAP works fine). Feb 21 06:57:04 r2d2 dovecot: pop3(br@telecomm.com): Disconnected: Logged out ...
1
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2answers
61 views

Can't connect with telnet from external ip

I have a postfix server running on a kimsufi VPS, i installed roundcube on it, and everything is ok. The problem is, when i try to connect from another server, i have a timeout : telnet whys.fr 25 ...
0
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1answer
30 views

Failed Gmail SPF check when importing mail through IMAP from our mailbox when original email was sent with ESMTP headers

We have a strange situation: we receive an email with ESMTP headers in it our server accepts it, it's fine we import that mail in Gmail like any other emails from our boxes Gmail makes SPF check ...
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1answer
33 views

How can I configure a Haraka mail server to forward mails to another address on another domain?

I'd like to setup an Haraka mail server on a domain (let's say 'example.com') that will only act as a forwarding service to a 'gmail.com' email address. For the sake of the example let's say I'd like ...
0
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0answers
11 views

When using an “Internal Relay Domain” as an Accepted Domain, what email addresses must be synched?

There are a number of SMTP addresses associated with a user in Exchange SMTP, X500, X400, etc. In addition there is a LegacyDN. Some of these email addresses are stored in the NK2 files and also in ...
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votes
1answer
21 views

exim quota limiting SMTP per minute [closed]

I have tried to set a quota limit per minute in exim configuration over cpanel server for mail server use. I have code but it doesn't seem to work, SMTP connections still exceed the quota limit. What ...
0
votes
1answer
52 views

SPF records when sending multi-domain emails from one host

We have a CMS system in which multiple customers run their websites from a single virtual machine. Pages generated by the CMS allow forms to be filled in, which trigger emails to be sent. I am having ...
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0answers
28 views

Spamassassin filter exception

Currently we have set SMTP for our network (without auth and SASL from remote) and if I send for example .bat files packed in ZIP (of course without viruses), then email back with an error message: ...
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votes
0answers
19 views

Postfix relayhost and local users [duplicate]

I'm attempting to migrate mail users from a local server to a google-apps account. I want to move a trial set of users over. At the moment the users are using our local server for SMTP purposes, if ...
0
votes
0answers
19 views

Is it possible to whitelabel MX records? [duplicate]

I have a domain at example.com. I would like to setup email hosting with Zoho email services. Is it possible to setup imap.example.com to forward to imap.zoho.com? I have tried adding a CNAME ...
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0answers
33 views

postfix outbound emails getting deferred

All outbound emails to yahoo and gmail exit the server but never get delivered. All emails get 'deferred'. I can see yahoo and gmail hitting my database via query logging in MySQL -> ...
2
votes
1answer
48 views

reason: 403 4.7.0 TLS handshake failed

Sending email to one particular domain, I get the following error: ----- The following addresses had permanent fatal errors ----- <> (reason: 403 4.7.0 TLS handshake failed.) ----- ...
1
vote
1answer
29 views

Postfix SMTP recipient filter not filtering

I have setup Postfix with a list of blacklisted recipients, so that the Postfix server should not relay mail to them (smtpd_recipient_access parameter in main.cf). The addresses are properly listed ...
2
votes
1answer
71 views

NOQUEUE: reject: RCPT from on freebsd and postfix

I am building a server using this config -> http://www.purplehat.org/?page_id=4 and when trying to test basic email capabilities I get -> NOQUEUE: reject: RCPT from when try to send a test email. ...
0
votes
2answers
69 views

Email server attack from telnet

My mail server having a problem on blocking some attacker that trying to telnet to our mailserver. but i'm not able to block it, ip will keep changing even we block by ip. seems like he is trying to ...
2
votes
1answer
34 views

Exchange 2010 is trying to relay messages for delivery

I am using Exchange 2010 on premises. I am in the process of setting up a SMTP proxy that will receive all messages coming into the office, log them, then forward them to my exchange server for local ...
3
votes
0answers
57 views

Why Outlook, Hotmail and Live return 250 Mail queued for delivery, but they never deliver it?

Ok, i've been seeing this the last week, tought it could be gone in a few days by itself, since i wasn't blacklisted and my DNS entries are all ok, but when i try to send e-mails to some user at ...
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0answers
94 views

How to set gmail smtp on Postfix (Centos 6.6)

i am out of luck, have tried almost everything but it does not work. I have a static IP. Now the log error: **Must issue a STARTTLS command first...** Here is the main.cf config: # postfix ...
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votes
1answer
40 views

Overcome Gmail smtp send limit [closed]

I have a few IP cameras which sends photos to an email address if motion is detected. My problem is that someone times a lot of motion happening and the camera will flood the Gmail smtp server which ...
1
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1answer
28 views

Relay Mail from an application to Gmail through ssmtp

i want make my linux server to receive mail from an host (LAN but if possible through Internet) and than relay to Gmail. I made the second part with ssmtp let the server send mail through Gmail using ...
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votes
0answers
24 views

Setting up SMTP correctly [duplicate]

I've created a mailbox on my VPS, using CentOS and Virtualmin. But all mails that I send go to trash. I've used http://mxtoolbox.com/ and from what I understand it goes to the trashmail because of a ...
0
votes
1answer
29 views

exim4: queue_run_max: not found

I need to manage the number of outgoing concurrent SMTP connections - other mail servers are complaining that I have more than 50 concurrent connections and throttling my outgoing mail. I googled and ...
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votes
0answers
33 views

Postfix cannot receive email from external domain

I know this question has been asked umpteen times, but after lot of research, it did not solve my problem, so I thought of posting it. I've installed postfix on a server. I use ssh to log into the ...
1
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0answers
23 views

Outlook stalls when sending multiple emails

I have an issue very specific to outlook and a single email domain. I work for an email and website hosting company. When sending one email to a foreign domain, no issues. When sending more then ...
1
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1answer
41 views

Which incoming port is required by JIRA's outgoing (SMTP) e-mail functionality?

I have a JIRA 6.3.15 installed on an Ubuntu 14.04 in a VirtualBox VM. The host system for VirtualBox also is an Ubuntu 14.04. I configured JIRA to use SSL (as described here ...
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0answers
78 views

Exchange 2013 - Reverse DNS does not match SMTP Banner

mxtoolbox gives me some negative points i would like to ask about im behind Cisco, which doesnt currently support TLS/esmt stuff, will be upgrading OS later. Currently my HELO looks like: 220 ...
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2answers
63 views

Reliably send small amount of mail from possibly blacklisted cloud IPs

So you boot a new cloud server. Only to discover that its IP is blacklisted by misbehavior of the previous owner. How to make sure your mail gets delivered for a modest price? Context: I provide my ...
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votes
2answers
27 views

Can I use SRV to receive mail on port 2525 ? How must I configure it in my DNS? [duplicate]

Is it possible to use a SRV rule on my DNS to receive mail on port 2525 instead of port 25 ? If it is possible how can I setup this rule correctly ?
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votes
1answer
34 views

Sending emails from non-configured domains with postfix/dovecot

I am trying to setup a mail server with postfix/dovecot. I can currently receive emails and send emails from domains that I have configured. I have a lot of domains and my email setup is simple - ...
1
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1answer
64 views

Postfix lookup failure: works from localhost, not on other nodes in LAN

I am getting temporary lookup failure for the recipient address when trying to send email using Postfix and Gmail from a machine other than the host, on the same network. It works just fine when ...
0
votes
2answers
48 views

How to set exim to use outside SMTP?

I want my scripts on the server to be able to send emails, but via outside, 3rd party mail service for which I'm paying anyway. I have exim and even dovecot installed anyway, but I suppose i will need ...
0
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2answers
33 views

Disable SMTP on Windows SBS 2011

I have a server running Windows Small Business Server 2011 Standard. I have disabled the SMTP service, removed the Web Server Role, and blocked port 25 in Windows Firewall. Why am I still able to ...
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votes
0answers
64 views

Transaction Emails Magento 1.9.0.1 AWS and Amazon SES

I am working on a magento store which is installed on AWS EC2. I have setup Amazon SES to handle email and I installed the extension aschroder SMTP which supports Amazon SES. Using this system I am ...
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votes
0answers
40 views

Postfix SMTP mail is sent to SPAM

I have installed postfix mail server in ubuntu machine. I configured the mail server as well as DNS properly. Mails are sent from our mail server properly, but all the mails are listed in the spam ...
0
votes
1answer
48 views

Incorrect FQDN on Exim4 send-only SMTP mail server

I am pretty new to Linux systems and I am trying to send e-mail to my gmail ID using exim4. I found many tutorials for exim4 online and I am doing exactly that, however I never receive any email. The ...
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0answers
45 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 ...
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votes
1answer
81 views

gmail blocking 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 ...
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votes
1answer
62 views

Sendmail (or postfix or somebody) not speaking SMTP

I've got a Linode Debian server which tries to send email (normally through PHP, but mail from the command line doesn't work either). But the mail never arrives successfully. My two clues from people ...
0
votes
2answers
40 views

Which Exchange 2013 Role will allow mail relay

We have a service that connects to our default receive connector in exchange, which relays the message to external users. Currently I have configured the service to use my DA account which assigned ...
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votes
2answers
37 views

Exchange server accepts email without authentication. Is this a misconfiguration?

I am a user on a network with an exchange server and there is an HP scanner/email machine that can send emails with scanned docs as an attachment from any email address without authentication so I ...
0
votes
3answers
123 views

Certificate on port 25 when trying to secure SMTP with POSTFIX

Background I think I am close to getting my POSTFIX setup to my liking. I've run some SMTP online checks and my SMTP passes all the basic security tests. I get a certificate warning in Thunderbird. ...
0
votes
1answer
21 views

Exchange 2013 SMTP reply error not being sent

We are scanning to our exchange 2013 server from a scanning application that uses smtp, in the past when the mail exceeded the smtp size limit it would send an email with a link instead of the scanned ...
0
votes
1answer
37 views

Postfix with external SMTP

I'm trying to install Request Tracker and configure it to use an external SMTP server to sent mail notifications. I've already put postfix to send emails using this tutorial, but it keeps sending then ...