Simple Mail Transfer Protocol (SMTP) relaying (transferring between computers).

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0answers
477 views

What are the values of Exchange's XSHADOW and XQDISCARD commands?

Shadow redundancy is an Exchange-specific feature (beginning with Exchange 2010) that provides a measure of fault tolerance when relaying email messages with SMTP. The sending Exchange server sends ...
-3
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1answer
42 views

outbound smtp mail server, port 25

Folks, In the past, I remember having to open port 25 for email servers to check back and verify that in fact, an email was sent from an email server. Does this still pertain these days? If you ...
4
votes
2answers
457 views

Security Risk involved in disabling SMTP authentication on POP3 Server?

I provide IT Services to a client who, for the longest time in the world, has been using a POP3 server from Network Solutions to handle their email. At this time, I'm introducing the McAfee SaaS ...
2
votes
2answers
8k 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 ...
0
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0answers
260 views

SMTP relay to Exchange Online - won't work without remote domain smarthosts?

We've got an on-premise SharePoint farm that sends and receives email via an SMTP instance on one of the servers which relays to our on-premise Exchange. We're in the middle of a migration to ...
0
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1answer
348 views

How to have Postfix send email to another server if user lookup fails for specific domains

Currently my server acts as a gateway, checks AD for valid email addresses, if the email address exists in exchange it sends over the email, otherwise just rejects (typical) I need Postfix to send ...
1
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1answer
216 views

Postfix Transport Not Getting Triggered

I have ServerA and ServerB - I'm moving accounts from A to B but I want ServerA to relay any mail it receives to ServerB to make sure no mail gets lost after I have copied mailboxes over while DNS ...
0
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1answer
495 views

postfix 550 relay not permitted for virtual mailbox domain

When somebody sends mail to myvirtualdomain.com I get the message Remote host said: 550 relay not permitted! [RCPT_TO] What is wrong with my settings? I do not think the problem is in the mysql ...
1
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3answers
5k views

How to configure sendmail to relay emails through Office 365 (SMTP) with TLS

I have a box running RHEL 6.3 and there's and application that needs to send out reports by mail, in order for this functionality to work I have to have mail configured in my box. In addition I ...
1
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2answers
153 views

Postifx: how can someone send e-mail without authorization with this configuration?

Yesterday I found that 10 thousand e-mail messages were sent through my system using this configuration: http://pastebin.com/bThpH1s8 - main.cf http://pastebin.com/kkxxsstP - master.cf I temporarily ...
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5answers
513 views

Best Practices for Open Relay Email Server

I have a scenario where I need to setup postfix with no TLS, no SMTP authentication, and open relay allowing from only one remote IP address. Emails from this remote IP may have spoofed "from" address ...
2
votes
1answer
2k 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 ...
1
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0answers
207 views

Postfix: Modify sender address based on recipient

We have a Postfix server that receives mail from our application servers. Senders are in the form user@host.fqdn (where host.fqdn can vary, depending on source server) and recipients can be internal ...
1
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1answer
131 views

Exchange 2007 Server - Sender unable to send one recipient in the domain

I have a mail server that serves multiple domains. I have 2 users that use a specific domain. User A does not experience any issues when sending and receiving mail. User B can send emails fine and ...
0
votes
1answer
3k views

POSTFIX bouncing when destination is my domain

I am using provider mail hosting to send emails. On my Webserver I also have Postfix running and configured. Here is my main.cf smtpd_banner = $myhostname ESMTP $mail_name (Ubuntu) biff = no ...
0
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1answer
292 views

RAID Card Event Notifications Email to Gmail

I need to get email for event notifications from our RocketRaid 2782. The problem is I don't see a way to get it to send mail to our google apps gmail account. I don't think the card offers ...
1
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1answer
279 views

Postfix mail gateway/relay for limited domains

I have a number of servers at a hosting space. What is the best way or is it possible to run a relay on one of the system to send all emails to alerts@myowndomain.com to our email hosting service ? ...
1
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0answers
867 views

530 5.7.1 Client was not authenticated Exchange 2010 for some computers within mask

We have a classic problem with Client not Authenticated but with a specific twist: We have an Exchange 2010 cluster, let's say EX01 and EX02, the connection is always to smtp.acme.com, then it is ...
2
votes
1answer
124 views

Postfix as a relay for specific networks only

I have a strange issue with postfix that is driving me a little up the wall as it seems to work 50% of the time but with no changes made. What I want to achieve: I have a number of virtual servers ...
0
votes
1answer
167 views

Postfix: Ignore relay host when from specific address

I configured my postfix server to relay all received mails to smtp.example.com with relayhost. This server doesn't accept mails from an external source. So only scripts are sending mails. Is it ...
0
votes
1answer
688 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 ...
3
votes
1answer
348 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
2answers
1k views

PHP Mail Relay via Remote smtp Server [duplicate]

Possible Duplicate: How to configure php.ini with remote SMTP? We have a php application running on Linux which sends emails to there users. Currently its setup like php.ini is configured ...
0
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1answer
1k views

Cannot send email outside of network using Postfix

I've set up an Ubuntu server with Request Tracker following this guide (the section about inbound mail would be relevant). However, while I'm able to send mail to other users within the ...
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4answers
6k views

Postfix- open relay. How to configure so it is not?

I have setup Postfix but am having trouble with the setup. Whenever I used to send emails to the server, it reject my mails saying 'Relaying Denied', so I changed the following in main.cf: ...
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2answers
1k views

postfix and iRedMail- Relaying Denied

I am trying to setup iRedMail and am way over my head here. I have installed it, and can send emails internally, but not externally. When I send an email from outside, I get the following return ...
0
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2answers
2k views

Allow receiving and sending of local mail, disable remote relay on postfix

I just installed mutt and postfix on my server and I've been playing around with it. Now, however, I want to make sure that no one can remotely send mail with my server as a SMTP relay. I don't know ...
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1answer
164 views

Exchange SMTP address limit

i have an Exchange SMTP server but I want to enable this SMTP just for my email addresses (i don't want an open rely mail). How can I block all other recipients? Thanks.
0
votes
1answer
314 views

How does “sendmail” send mails to any domain name?

I noticed that one of our servers (running Ubuntu) can send mails to any domain (yahoo.com ,gmail.com) using simple "sendmail" command. But I cannot figure out how to configure similar setup in a new ...
1
vote
1answer
250 views

smtp relay only works on gmail accounts

I have a client who has a server but does not host their own email. They have just purchased a MFC and want to scan-to-email. I have them set up to send mail to gmail, however if they try to send to ...
1
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3answers
2k views

Ubuntu Postfix Gmail SMTP Relay Not Working

I currently have postfix set up to relay messages from my websites through gmail, and up until recently it was working perfectly. However, within the last week or so (not really sure when) I started ...
0
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1answer
442 views

Mail forwarding to external domain - BT, Exchange 2010

Thanks in advance for any help, this is not a basic mail forwarding question there is in fact a twist. We are trying to forward mail from an address at our domain john.example@ourdomain.com to ...
1
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1answer
358 views

Windows SMTP Relay Server to add BCC to all emails

I'm looking for a Windows based SMTP Relay Server which allows me to add a specific BCC field to all outgoing emails that relayed through this server. The reason for such requirement is that we need ...
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2answers
1k views

Problems sending email using .Net's SmtpClient

I've been looking through questions on Stackoverflow and Serverfault but haven't found the same problem mentioned - though that may be because I just don't know enough about how email works to ...
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1answer
853 views

using gmail as email relay for sendmail

I used to be able to send emails using a gmail account & sendmail configured using one of the guides on the Internet, for example: ...
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votes
2answers
1k views

Same domain only : smtp; 5.1.0 - Unknown address error 530-'SMTP authentication is required [closed]

I have a very strange problem after moving my netwave.be domain from WebHost4Life to Arvixe. I configured several email adresses, like steven@netwave.be and sandra@netwave.be. For POP3 I can use ...
0
votes
1answer
375 views

postfix specify limited relay domain while allowing sasl-auth relay

I'm trying to set up postfix to allow relaying under a limited set of conditions: The destination domain is one of a pre-defined list -or- The client successfully logs in Here's the relevant bits ...
0
votes
1answer
90 views

Want to store To,From,Bounce,and mailstatus in sql database?

On my postfix relay server i want that postfix do not create /var/log/maillog file and directly store To, From,Bounce Address and mail status directely in sql server database. How can i do this ?
2
votes
1answer
192 views

SBS/Exchange 2003 Open Relay on Malformed Email Address

I have a Small Business Server 2003 (Exchange 2003 SP2). During a PCI Compliance audit, it was flagged as failing the open relay. I've used telnet to test, and here is what I've found: MAIL FROM: ...
1
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1answer
198 views

Setup Postfix as a relay / filter

I need to have Postfix set up to work with Lamson. Despite my research on the web, i haven't figured out how to configure postfix. I'll have a server (A) that will forward all its email to a second ...
1
vote
1answer
524 views

Disable local recipient check in Postfix

I am trying to setup Postfix on CentOS. I have configured it to use my Google apps account to send mails. Lets say I have configured Postfix to use user1@mydomain.net, which is a Google apps email. I ...
0
votes
0answers
147 views

SMTP server force outbound traffic [duplicate]

I'm having some trouble with setting up a SMTP server on a windows server 2003 machine, while trying to send emails using PHP through the internet, but to domain email addresses. Common info: I'm a ...
0
votes
2answers
1k views

Setting up SMTP server (Windows 2008 R2) to use with Microsoft Data Protection Manager

DPM is installed on one of our servers - namely Datacenter. Essentially, there is no Exchange server in the domain, so we wanted to setup our own SMTP, and use a gMail account to forward ...
0
votes
1answer
224 views

exim greylisting non-auth SMTP mail?

I have smtp auth set up on my exim4 Dqueeze server so that only auth'ed clients can use it as a mail relay. I believe this is working, e.g. thunderbird (w/out password) reports that I am "not yet ...
1
vote
1answer
267 views

relay_domains seems to be ignored by postfix

I am trying to set up a perimeter spam and malware filter using CentOS/Postfix/SpamAssassin. Unfortunately, I am still stuck on the PostFix part. I've setup a new subdomain DNS with its own A/MX ...
2
votes
0answers
29 views

I need to set-up the blocked machine to relay to the unblocked machine using a different port

I have two Windows Server 2003 machines sitting in a network. Server B has port 25 open and can relay emails to the local network's smtp server. Server A does not have port 25 open. How can I set it ...
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votes
2answers
278 views

SMTP server on debian 6.0 linux

I have some questions: I am using a SMTP service for sending monthly newsletter for my website (~3000 email addresses). I was thinking: I already own a virtual server configured as a web server and ...
3
votes
3answers
1k views

How to force Windows Server 2008 R2's SMTP server to generate NDRs for non-existing local users?

I have a Windows Server 2008 R2 server with the SMTP service enabled, which provides mail relay to another server for some applications. Sometimes, a message comes in with a wrong "To:" address, ...
2
votes
1answer
518 views

Nginx Ubuntu Postfix Config - Can't connect to incoming IMAP server 'server not responding' but can send mail via outgoing using same details?

I'm pretty to new server admin and especially nginx but seem to be getting ok fine apart from accessing my mail via my iPhone? I've changed my domain to 'domain.com' The thing is I can send mail ...
1
vote
1answer
1k views

DKIM on postfix relay server

I have a postfix/amavis relay server, with the domain name mail.example.com. It will be a relay for dozens of VPS's, which will have domains like hostname.example.net. So i have actually two ...