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[en@sympa] Sympa DNS entries with AWS EC2 and NLB?
- From: "Widerski, Betty" <address@concealed>
- To: "address@concealed" <address@concealed>
- Subject: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?
- Date: Wed, 4 Feb 2026 21:49:51 +0000
Question for sites who are hosting a Sympa server on an AWS EC2: How are you doing DNS entries for the domain name that is both the mailing address (address@concealed) and
the web interface address (https://lists.my.edu)? We are attempting to migrate a Sympa server to AWS and my cloud engineers are saying that having an A record plus an MX record (which is
what we did onprem using an F5) is not always functioning correctly. Plus their concern is that the NLB being used between the EC2 and the public web has 3 IP addresses that are not guaranteed to be permanently static.
The engineers asked if it was possible to assign the web address as like https://otherlists.my.edu leaving “lists.my.edu” as the MX for mailing.
I wasn’t sure if this would break web links or list maintenance pages using the domain name variable when creating the html pages.
I’m not sure I’ve correctly explained this, so please ask for clarification if this is insufficient information.
Thanks
Betty
Betty Widerski
Cloud & Server Engineering – HBS Information Technology
HARVARD BUSINESS SCHOOL
Shad 108 N | address@concealed | T: 617.212.3056
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[en@sympa] Sympa DNS entries with AWS EC2 and NLB?,
Widerski, Betty, 02/04/2026
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Re: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?,
Matthew Goebel, 02/04/2026
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Re: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?,
Victor O, 02/05/2026
- RE: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?, Widerski, Betty, 02/05/2026
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Re: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?,
Victor O, 02/05/2026
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Re: [en@sympa] Sympa DNS entries with AWS EC2 and NLB?,
Matthew Goebel, 02/04/2026
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