If it’s under the lintel where the door has been fitted and there’s a tiny gap then yes. this is common practice to seal to door.
but if it’s on top of the lintel and it’s for a brick to be bedded then no. this is pretty dangerous
These old properties never had a damp course and was most likely laid with no foundation. you can buy a damp proof product that you drill into the wall at low level to help stop this
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