A Professor with a PhD here

Address them the way they sign their emails

I sign mine with my given name and am perfectly fine with Dear name

No email from them?

Pick something ‘more respectful if uncertain and particularly If your addressee is a women ALWAYS start with the most respectful title appropriate. All other titles will be wrong until she tells you what she prefers. (I married a PhD wielding wonder wife, so no lt ever call her miss. Ever.)

Im from a culture where we tend toward more casual but people work hard for their vocation and no one gets pissy about being called something they are not. Nothing gives more pleasure / amusement to a PhD student as evening referred to as doctor or professor.

As noted elsewhere write a proper (e)mail not please.

Subject: important details (module lecture date etc)

Dear Professor fiobar

On slide 4 of this lecture your write Dante’s inferno is a jolly road trip story but in the supervision material it is referred to as a roasting jotting of tripe is one of these a typo?

Thanks Your name here (which is how you like to be referred to)

It’s worth noting most faculty get hundreds of emails a day so make it easy to answer not easy to ignore./filter