באימייל הרשמי ששלחתי לעירייה ציינתי בעיקר את הבעיה עם הכתובת.

ב־ is the preposition in / at / via / by depending on context. In this sentence, באימייל means in the email or by email.

It is made of:

• ב־ = in / by
• אימייל = email

Because Hebrew often attaches short prepositions directly to the following word, you get באימייל rather than writing them separately.

Here it refers to the medium or place where something was stated: the speaker mentioned something in the official email.

Because the noun אימייל is definite here: the official email.

In Hebrew, adjectives usually come after the noun, and if the noun is definite, the adjective must also be definite.

So:

• אימייל רשמי = an official email
• האימייל הרשמי = the official email

Since the preposition ב־ is attached to a definite noun phrase, באימייל הרשמי means in the official email.

This is a very important Hebrew pattern:

• noun first
• adjective second
• both marked as definite when needed

The definite article ה־ is still there, but it merges with the preposition ב־.

So:

• ב + אימייל = באימייל = in an email
• ב + ה + אימייל also becomes באימייל = in the email

In modern spelling without vowel marks, these can look identical, so you usually understand from context whether it means in an email or in the email.

Here, because of הרשמי and the overall meaning, it is clearly in the official email.

ש־ is a very common Hebrew relative particle meaning that / which / who.

So:

• שלחתי = I sent
• ששלחתי = that I sent

In the sentence, האימייל הרשמי ששלחתי לעירייה means: the official email that I sent to the municipality

This is the normal way Hebrew forms relative clauses. English often uses that or sometimes leaves it out; Hebrew usually uses ש־.

ל־ usually means to / for.

So:

• עירייה = municipality / city hall
• לעירייה = to the municipality

The form לעירייה includes:

• ל־ = to
• ה־ = the
• עירייה = municipality

Just like with ב־, the preposition and the article combine in writing.

So ששלחתי לעירייה means that I sent to the municipality.

ציינתי is first person singular past: I mentioned / I noted / I pointed out.

It comes from the verb לציין.

Examples:

• ציינתי = I mentioned
• ציינת = you mentioned (to a male)
• ציינתְּ = you mentioned (to a female)
• ציין = he mentioned
• ציינה = she mentioned

So the speaker is saying that they mentioned something in the email.

בעיקר means mainly / בעיקר / chiefly.

It modifies the verb ציינתי, so the sense is: I mainly mentioned...

Hebrew adverbs like בעיקר are fairly flexible in position, but here it sits naturally before the direct object:

• ציינתי בעיקר את הבעיה...

That means the speaker is emphasizing that among the things they wrote, the main thing they mentioned was this problem.

את is the Hebrew marker for a definite direct object.

It does not translate into English, but it appears before a direct object that is definite, such as one with the, a name, or a pronoun.

Here:

• הבעיה = the problem
• since it is definite, Hebrew uses את
• ציינתי את הבעיה = I mentioned the problem

Compare:

• ציינתי בעיה = I mentioned a problem
• ציינתי את הבעיה = I mentioned the problem

So את is there because הבעיה is a specific, definite problem.

Both nouns are definite:

• הבעיה = the problem
• הכתובת = the address

This tells us the speaker is talking about a specific known problem and a specific address, not just any problem or any address.

Hebrew uses ה־ as the definite article, like English the.

So:

• בעיה = a problem
• הבעיה = the problem
• כתובת = an address
• הכתובת = the address

עם usually means with.

So הבעיה עם הכתובת literally means the problem with the address.

This is a very common Hebrew structure:

• בעיה עם... = a problem with...

For example:

• יש בעיה עם המחשב = There is a problem with the computer
• יש בעיה עם החשבון = There is a problem with the bill/account

So in your sentence, the issue being mentioned concerns the address.

Yes, it is very natural.

The sentence is: באימייל הרשמי ששלחתי לעירייה ציינתי בעיקר את הבעיה עם הכתובת.

A rough structure is:

• באימייל הרשמי ששלחתי לעירייה = setting/context
• ציינתי = main verb
• בעיקר = adverb
• את הבעיה עם הכתובת = direct object

Hebrew often allows a time/place/context phrase to come first, followed by the main action.

A more neutral order could also be: ציינתי בעיקר את הבעיה עם הכתובת באימייל הרשמי ששלחתי לעירייה.

That would still be grammatical, but the original sentence puts early emphasis on where this was mentioned: in the official email.

No. אימייל is very common in everyday modern Hebrew, but you may also see:

• מייל
• דוא"ל = a more formal abbreviation for electronic mail

So depending on style:

• באימייל הרשמי
• במייל הרשמי
• בדוא"ל הרשמי

All can work, but אימייל sounds very normal and natural in modern spoken and written Hebrew.