In a letter, I would address an Imam as:
Dear respected Imam John Dow,
some address an Imam as Sheikh, very common among Arabs in the Middle East,
Dear respected Sheikh John Dow,
and instead of saying Mr., people would say Sheikh, or Imam:
Imam Dow has been kind enough to accept our invitation.
Sheikh Dow has been kind enough to accept our invitation.
Imam
Imam
Imam.
imam
imam.
Imam Sadiq S.A. is son of Imam Baqir S.A. Imam Baqir S.A. is son of Imam Sajjad S.A Imam Sajjad S.A is son of Imam Hussain S.A. Imam Hussain S.A. and Imam Hasan S.A. are children of Imam Ali S.A.
In English you call him: leader of the mosque. But in Arabic you call him: Imam ul-masjid. However, most people just call him : Imam.
Imam Hasan S.A. and Imam Hussain S.A.
The importance of an imam can vary depending on context and beliefs. Some widely recognized influential imams include Imam al-Ghazali, Imam Malik, Imam Bukhari, and Imam al-Shafi'i. Ultimately, the significance of an imam is subjective and can differ among different Islamic communities.
The return address on a letter is the address of the person sending the letter. It is important for the recipient of the letter to know from whom and where the letter originated and to have an address to respond, if necessary.
Imam Haniffa
after martyrdom of his father he became Imam at age 22