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mailu/core
bors[bot] 2e9b14d536
Merge #2254
2254: Send ISRG_X1 on port 25, make DANE pin that r=mergify[bot] a=nextgens

## What type of PR?

bug-fix

## What does this PR do?

Ensure we send ISRG_X1 in the handshake on port 25 (non-interactive, size doesn't really matter).

Update the DANE pin to reflect the change.

I am not sure whether we will need to add --preferred-chain= in the future; This may be the case when letsencrypt decides to use X2/the ECDSA chain

This needs to be tested on a letsencrypt account that isn't mine (I'm opted in for the alternate cert chains)

### Related issue(s)
- closes #2138

## Prerequisites
Before we can consider review and merge, please make sure the following list is done and checked.
If an entry in not applicable, you can check it or remove it from the list.

There's already a towncrier news for it

Co-authored-by: Florent Daigniere <nextgens@freenetproject.org>
3 years ago
..
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