🐛: Duplicate SRV records in Zonefile

[vifino]

What happened?

When using multiple listeners binding the same ports ("submission_public" and "submission_private"), the Zonefile contains multiple SRV _submission._tcp records for the same ports.

How can we reproduce the problem?

1. Create two smtp listeners bound to different IP addresses, but on the same port.

[server.listener.submission_public]
bind = ["1.2.3.4:25"]
protocol = "smtp"

[server.listener.submission_private]
bind = ["192.0.2.1:25"]
protocol = "smtp"

2. Create a domain.
3. View DNS records and observe duplicate entries.

Version

v0.11.x

What database are you using?

RocksDB

What blob storage are you using?

RocksDB

Where is your directory located?

Internal

What operating system are you using?

Linux

Relevant log output

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