Aha!
In the database dump I have one domain alias as:
INSERT INTO “aliases” VALUES(120,‘example.org’,‘@example.net’,NULL);
with another as:
INSERT INTO “aliases” VALUES(103,‘@example2.org’,‘@example2.info’,NULL);
So, I suspect that the missing ‘@’ in the first one is the issue … now, just to figure out how to get the database dump back into a database once I edit that error. Thank you!