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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730 views

Postfix: Relay access denied through SASL with permit_sasl_authenticated setted

I have Postfix 2.7 installed in Ubuntu 10.04 LTS. When I try to send a mail from Outlook (with smtp auth) to a gmail account (or others), I get relay access denied. The log (I've faked the emails): ...
4
votes
2answers
101 views

In SMTP, how does one choose between “Accept than Bounce” vs “Bounce at the edge”?

There seems to be a variety of implementations of SMTP that either immediately reject a message, and others that do an accept, then bounce the message. Operationally, the accept-than-bounce is a ...
4
votes
2answers
7k views

Google SMTP Error: 454 4.7.0 Too many login attempts, please try again later

I discovered that while it was possible to use Gmail/Google Apps as an SMTP server for scripted use, if too many emails were sent I started getting error messages: SMTP Error: 454 4.7.0 Too many ...
2
votes
2answers
2k views

Postfix dynamic smtp_helo_name

I have a mail server that relays e-mails for two different domains. I want the smtp_helo_name to be different based on the domain. I'm assuming there is no way to do this via checking the mail ...
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2answers
3k views

Plesk Postfix SMTP 550 5.7.1 “Command rejected” for one external sender [closed]

My server is rejecting emails from one external sender. I suspect this might be misconfiguration on the sending server, but I'm not sure from these error messages. The non-delivery report message the ...
0
votes
1answer
288 views

How to exempt localhost from SMTP smart relay?

I've got a mail server (mail.mydomain.com) that has a relay set up as such: /etc/postfix/main.cf: # Smarthost relayhost = [smtpcorp.com]:2525 smtp_sasl_password_maps = ...
0
votes
1answer
66 views

Postfix: delivering “local” mail to GMail, but sending other mail

I need to set up a server to send messages to a few different people automatically. The recipients are at two different domains, let's say mydomain.com and otherdomain.com. The messages need to come ...
1
vote
1answer
41 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 ...
0
votes
1answer
25 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
votes
2answers
328 views

Opening port 80 for outbound SMTP causing timeouts for apache [closed]

I have a (dv) Dedicated Virtual at Media Temple running Parallels/Plesk. Following this instruction, I was able to open an additional port and configure use of port 80 for use as SMTP outgoing mail ...
2
votes
1answer
124 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.) ----- ...
0
votes
2answers
52 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 ...
0
votes
1answer
27 views

Default Relayhost and custom relayhost for domains [closed]

I have a customer which needs a custom relayhost for sending emails. So I want to choose this relayhost only for this domain. customer.example.com -> relayhost A (all other domains) -> relayhost B ...
1
vote
2answers
58 views

Incoming mail rejected with “Invalid HELO name” [closed]

I'm unable to receive important emails from someone, with this error in my exim log: 2015-01-21 11:30:16 H=xxx.xxx.xx.xxx [xxx.xxx.xx.xxx]:50143 X=TLSv1:AES256-SHA:256 rejected MAIL ...
-1
votes
2answers
5k 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 ...
-1
votes
1answer
408 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 ...
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votes
0answers
25 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. ...
0
votes
1answer
52 views

Postfix check hosted sender domain [closed]

On my server I have this problem: there are mails sent from, example, johndoe@domain.com even if domain.com isn't hosted on my server. And, obviously, there is no johndoe@domain.com among the e-mail ...
-2
votes
1answer
67 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 ...
0
votes
1answer
68 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
votes
2answers
520 views

Emails delivered to Microsoft/Outlook successfully, but do not arrive in inbox/spam folders

Struggling with this for awhile. Have searched everywhere, read every post/thread I can find and have a thread started on Microsoft's "Answers" site, but the replies there are so slow. I am running ...
1
vote
2answers
84 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 ...
4
votes
2answers
377 views

Creating a “fake” open relay to capture non-relayable outgoing mail with postfix

We occasionally have customer-provided servers in our technical support and engineering departments. They're isolated on their own VLAN, with strict firewall rules in place to minimize possible bad ...
0
votes
1answer
54 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 ...
1
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1answer
1k views

Telnet to SMTP gets no 220 response unless user is specified

My server is setup to generate outgoing email only (no receiving), and is timing out when attempting to contact smtp.example.com Essentially the email is generated by a process on ...
0
votes
2answers
2k views

SMTP connection to gmail-smtp-in.l.google.com

I am writing an SMTP client in node.js. I successfully tested it against an SMTP server running on my localhost. However I found out that I am unable to connect to gmail's servers. Trying it with ...
0
votes
0answers
15 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 ...
8
votes
4answers
12k views

How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
0
votes
1answer
65 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 ...
3
votes
0answers
97 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 ...
1
vote
3answers
1k views

How to prevent remote hosts from delivering mail to Postfix with spoofed From header?

I have a host, let's call it foo.com, on which I'm running Postfix on Debian. Postfix is currently configured to do these things: All mail with @foo.com as recipient is handled by this Postfix ...
2
votes
1answer
107 views

Can someone explain SMTP Callbacks when BATV is enabled, and when to issue the verification?

This Wikipedia article describes how SMTP verification of the MFROM may have issues if BATV is enabled. Servers that reject all bounce mails (contrary to the RFCs). To work around this problem, ...
1
vote
2answers
2k views

Sending lots of mails using SmtpClient (C#) takes very long after a while

I'm using this piece of code to send a mail: SmtpClient client = new SmtpClient(); client.Host = smtpServer; client.Send(mailMessage); If I trigger this code ten times/second, then after some ...
0
votes
2answers
800 views

How do I configure PostFix to allow phpmailer to send out email through it?

I have setup postfix on CentOS and trying to configure phpmailer with smtp authentication. Phpmailer will only work if i put 0.0.0.0/0 under mynetworks in postfix main.conf mynetworks = 127.0.0.0/8, ...
0
votes
1answer
43 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 ...
3
votes
1answer
1k views

Mail queue retry interval practices

I'm configuring a custom made mail queue. The thing is there can be errors sending mail. Normally, one won't know the reason why the mail didn't reach it's destination. So the most simplistic solution ...
1
vote
1answer
41 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 ...
5
votes
1answer
47 views

Is Exchange 2010 compliant with RFC 3848

I have looked up Exchange 2010 Support for RFC Standards but do not see RFC 3848 amongst the supported standards. I do see RFC 4954 listed, which 'recommends use of RFC 3848 transmission types', ...
2
votes
4answers
656 views

A flexible SMTP server that's open source or free [closed]

We currently have our own in-house email marketing software for our newsletters, and were using SQL server's SMTP agent to send emails through our local SMTP server (IIS) and then onto our ISP's SMTP ...
0
votes
0answers
20 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 ...
2
votes
1answer
153 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
111 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
2answers
756 views

Send email through local SMTP vs google app engine

My web site is supposed to send email to customers and its hosted on a VPS. Should I use local SMTP or is it better to use a third party SMTP provider like Google App Engine? What are the ...
0
votes
1answer
1k views

Google Apps + Mailgun Split Delivery

We currently use Google Apps for receiving emails on our domain. We would like to send all mail to unknown addresses to our Mailgun server for further processing. This seems like a typical "split ...
2
votes
1answer
43 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 ...
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votes
1answer
51 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
vote
1answer
31 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 ...
0
votes
3answers
818 views

HP Power Manager SMTP setup doesn't have space for username & password

Is there some way to configure HP Power Manager to not assume that there's an email server running locally? We recently acquired an HP T1500 G3 UPS, which we're trying to control using HP Power ...
1
vote
1answer
57 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 ...
7
votes
1answer
3k views

Postfix TLS over SMTP - RCPT TO prompts renegotiation then 554 5.5.1 Error: no valid recipients

I've setup ispconfig3 on my debian six server, and here is a little smtp over ssl: The server is postfix AUTH PLAIN (LOL!) 235 2.7.0 Authentication successful MAIL FROM: lol@lol.com 250 2.1.0 Ok ...