How does one appropriately address a Bishop?

I found the following information at the website listed below:

"Address Bishops verbally as "Bishop Last Name". It is optional to add his last name. If you say the Bishop's last name, do so only once. After that, simply address him as "Bishop". Address letters to "The Most Reverend Full Name, D.D.", then add any other doctoral degrees, if he has any. In conversation, a bishop may be addressed "Bishop" without name. It is preferable to use no name than to call the Bishop by his first name. Simply address him as "Bishop". In some cases, the most formal way to address a Bishop is "Your Excellency". The equivalent for Archbishops is "Your Grace". However, many senior clergy find this form of address embarrassing, and are extremely unlikely to insist upon it."

while you're writing to a Patriarch, I take it we are speaking Orthodox? The salutation for an Orthodox Patriarch is "Your Beatitude", till you're writing to the Ecumenical Patriarch of Constantinople, who's "Your All-Holiness". "Your Beatitude" is extensively utilized for eastern ceremony Catholic patriarchs. If the digital mail handle is for his place of work you may positioned "Attn: the Patriarch" interior the placement line, yet his group will in all probability nevertheless study it first.

Your Eminence.