[local] feat: add "null" SMTP transport mode #14191

Job	Run time
changes	6s
integration-sqlite (capabilities_features, 8.1, main)	1m 44s
integration-sqlite (collaboration_features, 8.1, main)	2m 53s
integration-sqlite (comments_features, 8.1, main)	1m 33s
integration-sqlite (dav_features, 8.1, main)	7m 3s
integration-sqlite (features, 8.1, main)	7m 37s
integration-sqlite (federation_features, 8.1, main)	2m 51s
integration-sqlite (--tags ~@large files_features, 8.1, main)	10m 19s
integration-sqlite (filesdrop_features, 8.1, main)	1m 35s
integration-sqlite (openldap_features, 8.1, main)	2m 7s
integration-sqlite (openldap_numerical_features, 8.1, main)	1m 18s
integration-sqlite (ldap_features, 8.1, main)	1m 27s
integration-sqlite (remoteapi_features, 8.1, main)	1m 33s
integration-sqlite (setup_features, 8.1, main)	1m 20s
integration-sqlite (sharees_features, 8.1, main)	2m 30s
integration-sqlite (sharing_features, 8.1, main)	11m 6s
integration-sqlite (videoverification_features, 8.1, main)	4m 49s
integration-sqlite-summary	4s
	1h 1m 55s

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