SMTP

Exchange Server 2007: Can the quarantine mailbox be an external smtp address?

In Tuesday’s Birds of a Feather (BOF) session on Fighting Spam with Exchange Server 2007, someone from the audience wanted to know if an external (smtp) email address can be used as a quarantine mailbox. Exchange does no validation of the email address used for a quarantine mailbox – as long as it’s a valid […]

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Grimes Gripes About RBLs

InfoWorld columnist Roger Grimes gripes about Real-Time Block Lists (aka Real-Time Blackhole Lists, DNSBLs or DNS-based Block Lists. The Exchange Server 2007 term for RBLs is “IP Block List Providers”). The feelings towards RBLs are understandable – you won’t be a fan of RBLs if your IP addresses are the ones getting listed, and your […]

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Logging SMTP Protocol Activity in Exchange 2013/2010 and Exchange 2007

I wrote about logging SMTP protocol activity in Exchange Server 2003 in what is one of the most popular posts on Exchangepedia. Starting with Exchange Server 2007, Exchange discontinued using the SMTP stack in IIS and developed its own SMTP stack. I like to think of it as smarter or more intelligent Receive Connectors (these […]

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RFC 2821, HELO again: Validating the HELO/EHLO domain

RFCs 2821 and 1869 specify the format of HELO/EHLO commands issued by a SMTP client to initiate a SMTP session. RFC 2821 on HELO/EHLO command: 4.1.1.1 Extended HELLO (EHLO) or HELLO (HELO) These commands are used to identify the SMTP client to the SMTP server. The argument field contains the fully-qualified domain name of the […]

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Exchange Server 2007: Managing And Filtering Anti-Spam Agent Logs

Exchange 2007 includes a number of anti-spam agents to filter spam. The anti-spam agents log their actions in (anti-spam) agent logs. The default agent log locations: Exchange 2010: \Exchange Server\V14\TransportRoles\Logs\AgentLog Exchange 2007: \Exchange Server\TransportRoles\Logs\AgentLog Agent Log Configuration You can’t change the agent log location. Here are the available config options: Enable/Disable agent log: On transport […]

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Send as alternate email address in Outlook and Exchange

This is one of the more frequently asked questions in different forums and still a major annoyance – how do I send as an alternate address (aka proxy address or alias)? In most organizations, users have multiple email addresses to meet business requirements such as multiple business units, business names and domain names, mergers, acquisitions […]

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How to turn off Back Pressure on Exchange Server

In Exchange Server Transport error: 452 4.3.1 Insufficient system resources we learned how the Back Pressure (Previous versions: Exchange 2010 | Exchange 2007) feature monitors resource consumption on Exchange Server and stops accepting new message submission if it’s low on resources. Update: In Exchange 2013, when the Transport service on a Mailbox server or an […]

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Back Pressure and Exchange Server Transport error 452 4.3.1 Insufficient system resources

In my hotel room in Orlando, getting ready for an Exchange 2007 transport presentation tomorrow morning at TechMentor. When trying to telnet to the SMTP port of an Exchange 2007 Hub Transport server, I got the following error: 452 4.3.1 Insufficient system resources Not a good thing the night before a presentation – Murphy’s law […]

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Configuring firewalls and name resolution for Edge Transport servers

If you’re planning to deploy the Edge Transport server role in a perimeter network (aka “DMZ”), here are the ports you’ll need to open: Inbound:From external network (internet) to Edge server: SMTP – tcp port 25From Edge server to Hub Transport servers on internal network: SMTP – tcp port 25 Outbound:From Edge to external network/internet: […]

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A Late New Year’s Resolution: Do Not Resolve Anonymous Senders

It’s probably a little late to make another New Year’s resolution, but I’ll try to convince you to make one nevertheless. By default, when an internal/authenticated user sends you a message, you see the user’s display name (for example Joe Adams) in Outlook/OWA and other email clients. Messages from unauthenticated senders, including those from Internet […]

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