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5 Ways to Check Your Sending Reputation

For most home users, this listing should not impact you. This listing does not prevent you sending email unless your email program is not authenticating properly when it connects to your ISP or company's mail server. Verify that your mail program is using SMTP authentication, if it is not enabled you should enable it. You should verify that your username and password are up to date. Additionally you should verify that you are using the specified port for sending using authentication; for authentication this should be port If you are using port 25 you are most likely not authenticating and could be blocked.

For Server Administrators: Q: My mailer is professionally hosted with a static IP address, not a residential dial-up or broadband address. Why was it identified as a zombie? You may need to contact your hosting provider to resolve these issues. Such records are common for new machines, and are virtually indistinguishable from residential broadband addresses.

Q: My host does not relay on port Why am I listed as an open proxy? A: Open proxies are not limited to using port 25 and can often be found in relation to other applications that have been badly configured such as web servers or http proxies. Make sure that your machine is not accepting non-authenticated SMTP relay connections on any port. Also check for compromises to your machine, the existence of an open proxy often indicates a machine has been successfully attacked.

If the machine is professionally hosted, please contact your system administrator for help with these tasks. Never run port scanning software without explicit authorization from the network owner. Q: What if my server is behind a NAT? Continue following industry best practices and optimizing your email program.

Download the Email Marketing Lookbook to learn how to build and run an effective email program. You have a great sender reputation, and you may qualify for our Certification program, the industry-leading whitelist. Learn more about the Return Path Certification program. Learn More. Request a Demo. Read More. Know your sender reputation.

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SophosLabs Matrix Report. Today's Spam Threats We monitor spam from all sources, every day.

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