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0
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3answers
337 views

why sendmail resolves to ISP domain?

I wish to setup a local mail server for debugging purposes using fedora 15 I set up sendmail, but there is a problem. When I'm not connected to the internet, the local mail server delivers correctly ...
1
vote
2answers
690 views

Relay/forward only mail that originates from specific domain using postfix

I have 2 postfix servers (lets say mail.aaa.tld and mail.bbb.tld) that acts as a relays for several domains (lets say x.com, y.com, z.com) that are composed at ccc.tld. SMTP server at ccc.tld can ...
1
vote
2answers
84 views

Exchange 2007: relay only from selected servers based on rDNS

I'm looking for a way to make Exchange 2007 only accept mail from a certain group of hosts. These hosts all use the same identifying rDNS entry. Exchange 2003 uses a whitelist based on the reverse ...
0
votes
2answers
395 views

How to catch or filter specific sender or recipient

I have a bit of problem and I am pretty new in this field and I don't know how to set this. I have searched somewhere on the internet how to solve this but I don't really get all this stuff about ...
2
votes
1answer
571 views

ASA5505 DHCP relay to server 2008 R2 DHCP server

We have split our network up to add further security. I observe that the DHCP relay is working correctly and forwarding the packets to assign the IP address, but it's not appearing under "leased ...
1
vote
1answer
187 views

openvpn& iptables — portforwarding and gateway

The problem is similar to this scenario: iptables rule still take effect after deleted Scenario: There are several clients(C1~C10) providing some services, such as SSH,HTTP..... The clients are ...
1
vote
1answer
458 views

Sending mail from different IP for each domain

I have on one server domain1.com domain2.com domain3.com on CentOS and Qmail. I want them to send email trough a second server that uses ip1, ip2, ip3. I can easy do this by editing this Qmail file: ...
0
votes
1answer
703 views

554 5.7.1 Relay access denied iredmail

I have the feeling the answer to this may be obvious but my head is pickled with this. setting up a mail thing on ubuntu 13.04 with postfix,iredmail,mysql and that. Getting this in the logs when I try ...
0
votes
1answer
192 views

“Wrong” from name when sending mail through (smtp) Exchange 2003 from RT/Debian internally, ok externally

I think this is really simple to solve but I just need some input to get my brain working again. Followed this guide to set up RT on Debian: http://burn.co.nz/blog/?p=54 To explain the issue plain ...
0
votes
1answer
107 views

can Dovecot be used for relaying mail for user like a gateway?

I want to setup a gateway mailserver for relaying intranet users' incoming and outgoing email. I've setup postfix for relaying mail, but I dont know if dovecot can do this. e.g. Dovecot as gateway, ...
0
votes
1answer
192 views

Apache Module to hold connections | backend to DMZ - DMZ to backend

I'm looking for an Apache module or plugin which offers me the following functionality. I have an Architecture which includes the following components: Internet: mobile device External Firewall ...
0
votes
1answer
449 views

MAIL_HUB / LOCAL_RELAY for multiple domains

I'm running a debian server that hosts multiple domains, each of them using google apps. I managed to get sendmail to deliver the emails from domain1.com by using the following in ...
0
votes
1answer
169 views

Deny DHCP relay by corporate security policy

I've been presented with some odd "security conventions" in a large company I'm contracting with and am trying to get some perspectives on them. I need to build a number of servers virtualization ...
0
votes
1answer
276 views

Postfix Relay: An Entire Domain

Goal: Need to forward all mail destined for users @ domainA.com to users @ domainB.com. Using GApps for domainB.com. I setup a postfix relay that domainA.com's MX records point too. Able to send ...
0
votes
1answer
396 views

Client that relays through Exchange 2007 failing authentication

I have a client that uses AlphaPage First Responder to send pages to cell phones, pagers, etc. It can do everything but send out pages to cell phones fine. It sends cell phone pages through Exchange ...
0
votes
1answer
225 views

sendmail redhat

For some reason even after providing the sender's from adress my mails are not being delivered as from is missing as below maillog. Any suggestions? May 8 20:08:43 tawq02 sendmail[13443]: ...
2
votes
0answers
68 views

secured (relayed) NX setup

I am constructing a "secured" NX environment, and need some help. The situation is: there are 3 machines, A, B, C, where B is the "gateway" between A and C, in another word, A and C can never ...
0
votes
0answers
34 views

How to Relay All HTTP Requests to Another Server

Here is the scenario I need to work with. We have devices which need to talk to web service. This web service is hosted elsewhere and is accessible via DynDNS. Due to limitations on the device and our ...
0
votes
0answers
46 views

Need to setup an intermediary to accept, alter and resend a UDP packet

Currently ApplicationA on ServerA sends a UDP packet to ApplicationZ on ServerZ several times throughout the day based on several triggers. The problem is that some of the data in that packet is sent ...
0
votes
0answers
77 views

Own relay server using VPN

I have following setup: Server (NATed) connected via VPN to public relay server. There are many of these servers and all have an own VPN connection to the relay server. A client (mobile, NATed) sends ...
0
votes
0answers
96 views

Netcat relay issues

I have a legacy database application that can be accessed via ODBC on port 3000. I have set up a simple netcat relay on a bastion host so that this ODBC access can be done via the bastion host: ...