Lintian tag information: mail-transport-agent-dependency-does-not-specify-default-mta (type: warning)

Description (from lintian-explain-tags)

This package has a relationship with the mail-transport-agent virtual
package but does not specify the default-mta as an alternative.

default-mta and mail-transport-agent should only ever be in a set of
alternatives together, with default-mta listed first.

Please add a "or" dependency on default-mta before mail-transport-agent.

Visibility: warning
Show-Always: no
Check: fields/package-relations

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