login
1.You log in with your account or via or with your account
2.Your documents have been sent out by the express company or via express company. PS: Is it called express company?

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Also learn the phrase "by courier".  Use "by courier" and not "by the express company".

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You log in with your account.
You can send documents by or via express Mail.
By or via is fine.

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1. You log in with your account
2. 'sent by' and 'sent via' are both correct. "Send via" is a more formal and technical phrase that implies sending something through a particular channel or medium, such as courier or email.
3. Yes. it is called an express company.

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