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18 changes: 9 additions & 9 deletions USAGE.md
Original file line number Diff line number Diff line change
Expand Up @@ -36,9 +36,9 @@ print(header.json_string())
* [Using the SMTP API](#use-smtp-api)
* [Settings](#settings)
* [Categories](#categories)
* [Schedulling Parameters](#schedulling-parameters)
* [Scheduling Parameters](#scheduling-parameters)
* [Section Tags](#section-tags)
* [Subtitution Tags](#subtitution-tags)
* [Substitution Tags](#substitution-tags)
* [Suppression Groups](#suppression-groups)
* [Unique Arguments](#unique-arguments)

Expand Down Expand Up @@ -123,7 +123,7 @@ Sends a BCC copy of the email created in this transaction to the address specifi
# Categories
**This endpoint allows you to add categories to the X-SMTPAPI header of the emails you send via SendGrid**

By adding categories to the X-SMTPAPI header of the emails that you send via SendGrid you can to track emails based on your own categorization system.
By adding categories to the X-SMTPAPI header of the emails that you send via SendGrid you can to track emails based on your categorization system.

Categories must be in 7bit encoding using the US-ASCII character set, and should be used to group messages together by broad topic. If you need to attach unique data or identifiers to a message, use [Unique Arguments](https://sendgrid.com/docs/API_Reference/SMTP_API/unique_arguments.html) instead.

Expand Down Expand Up @@ -151,8 +151,8 @@ You can assign up to 10 categories per message:
}
```

<a name="schedulling-parameters"></a>
# Schedulling Parameters
<a name="scheduling-parameters"></a>
# Scheduling Parameters
**This endpoint allows you to send large volumes of email in queued batches or target individual recipients by specifying a custom UNIX timestamp parameter.**

This parameter allows SendGrid to begin processing a customer’s email requests before sending. SendGrid will then queue those messages and release them when the timestamp is exceeded. This technique allows for a more efficient way to distribute large email requests and can improve overall mail delivery time performance.
Expand All @@ -168,7 +168,7 @@ Using the parameters defined below, you can queue batches of emails targeting in
**Note: Using both send_at and send_each_at is not valid and will cause your request to be dropped.**

### Send At
To schedule a send request for a large batch of emails use the send_at parameter which will send all emails at approximately the same time. send_at is a UNIX timestamp.
To schedule a send request for a large batch of emails, use the send_at parameter which will send all emails at approximately the same time. send_at is a UNIX timestamp.

Example of **`send_at`** email header

Expand Down Expand Up @@ -212,8 +212,8 @@ The format of the SMTP API section tag has the form:
}
```

<a name="subtitution-tags"></a>
# Subtitution Tags
<a name="substitution-tags"></a>
# Substitution Tags

**This endpoint allows you to easily generate dynamic content for each recipient on your list.**

Expand Down Expand Up @@ -387,4 +387,4 @@ To apply different unique arguments to individual emails, you may use substituti
"customerAccountNumber": "-account_number-"
}
}
```
```