If there's a message in the subject header I don't see a problem with it. I'm pretty used to receiving these, both at work and for quick messages from friends.
I don't understand why you would see it as spam, OP? Particularly because it sounds like you know full well it's a reminder that your rent is due, why would you think your landlord was spamming you about rent?
I can see it at work - I do something similar, I suppose, with attachments. I'll put 'May Management Accounts' in the header, attach the file and my email has a signature. I'll do it for an internal email because I send the management accounts every month and everybody's expecting them.
I wouldn't do it externally - I wouldn't send the files to the auditors with nothing more than a header saying 'Name of Company' although I imagine they would work it out. It seems abrupt. And anyway, it's not quite what I understood was being done - these blank messages are apparently reminders
, not genuine transfer-of-information messages.
The one about the rent, it isn't regular rent from a landlord we're in regular communication with. This is a one off holiday week, and as it happens, the header doesn't actually ask for the rent, it just has the name of the property. The rent isn't overdue; it's due some time within the next five days, and actually, because this is a one off transaction, I would have expected to get a statement of account (by email possibly) quoting the booking reference, the date we're taking the house, the total balance and the deposit we've already paid, and a note of 'final payment by whatever date, please'. In fact, we're guessing that this is what the email is about. It could perfectly well be that the landlady's account has
been hacked and is
sending out spam. So in point of fact, we don't
know that it's a request for the rent. I suppose what I'm objecting to is that this isn't work, and the landlady isn't a friend; this is a pure business transaction and I don't think this is an appropriate business communication.
The other example my DH had heard was, in my opinion, even odder. The teacher of his evening class does occasional demonstrations at public events. He is booked to do one, say, on the August Bank Holiday at Thingummy Hall. Because Thingummy Hall wishes to print a programme, they want a small bio of him, and two lines about what he's going to demonstrate. He has had a blank email from Jane Smith, which says only 'Thingummy Hall'. He does not know who Jane Smith is or what her connection with Thingummy Hall is; her email is email@example.com
, not firstname.lastname@example.org
. So he doesn't know her (he was booked by David Jones), he doesn't recognise her address, and he's supposed to work out that she's chasing him for his programme notes?
And yet, when he emailed her back, saying that he'd had a blank email, and asking if she had a query, she said 'everybody does this, it's a standard reminder'. Well, standard it might be, but reminder it plainly was not, because it didn't succeed in reminding him of anything. It may be an extreme example, with a complete dearth of information, but is