# Send a single transactional email

**URL:** <https://community.hubspot.com/t/send-a-single-transactional-email/38160>\
**Category:** Email Marketing Tool\
**Tags:** email-deliverability\
**Created:** [May 31, 2021, 10:17am UTC](https://community.hubspot.com/t/send-a-single-transactional-email/38160 "2021-05-31T10:17:33Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![nPr](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/npr/32/102945_2.png) [@nPr](https://community.hubspot.com/u/nPr)\
**Post date:** [May 31, 2021, 10:17am UTC](https://community.hubspot.com/t/send-a-single-transactional-email/38160/1 "2021-05-31T10:17:33Z")

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Hi ,

I am in search of help to clarify the below,

1. Can I use pre-defined templates in single send transactional API?
2. Is there an API that helps me pull email templates created in hubspot?
3. Can A/B test transactional mails?

I want to leverage hubspot as a templating tool and provide a capability in my app to select template and send a mail from through hubspot.

thanks,

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**Author:** ![TitiCuisset](https://avatars.discourse-cdn.com/v4/letter/t/8baadc/32.png) [@TitiCuisset](https://community.hubspot.com/u/TitiCuisset)\
**Post date:** [June 1, 2021, 8:59am UTC](https://community.hubspot.com/t/send-a-single-transactional-email/38160/2 "2021-06-01T08:59:10Z")

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Hi @nPr

Thank you for reaching out.

I want to tag some of our experts on this @Bryantworks @lynton @MichaelC do you have any thoughts for @nPr on this?

Thank you!

Best

Tiphaine

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**Author:** ![Bryantworks](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/bryantworks/32/94963_2.png) [@Bryantworks](https://community.hubspot.com/u/Bryantworks)\
**Post date:** [June 1, 2021, 11:44am UTC](https://community.hubspot.com/t/send-a-single-transactional-email/38160/3 "2021-06-01T11:44:03Z")

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Hey @nPr (thanks for the tag [@TitiCuisset](https://community.hubspot.com/t5/user/viewprofilepage/user-id/89150)),

I’ll try to answer your questions in the same formatting for clarity:

1. Yes, you can use marketplace themes, drag and drop, as well as custom themes from the design manager
2. I don’t think so, but not 100% on this. You should reference the internal ID associated with the email. I commonly use a Gsheet to keep track of these.
3. Yes, you should be able to test A/B

Hope this helps!

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**Author:** ![system](https://d10pqhm3lwygmk.cloudfront.net/user_avatar/community.hubspot.com/system/32/124_2.png) [@system](https://community.hubspot.com/u/system)\
**Post date:** [June 1, 2021, 12:02pm UTC](https://community.hubspot.com/t/send-a-single-transactional-email/38160/4 "2021-06-01T12:02:43Z")

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Hi @nPr ,

I will try to answer your questions one by one.

1. Yes, you can use pre-defined templates using the Single-send API. The Single-send API sends template emails created in the HubSpot email tool using a JSON-formatted POST call.
2. Yes, you can use the SMTP API and the Single-send API.
3. Yes, you can A/B test transactional email content to optimize your overall transactional email performance.

Note that you need the transactional email add-on to use these APIs.

You can refer to this article to better understand how to use the Single-send API.

[https://legacydocs.hubspot.com/docs/methods/email/transactional\_email/single-send-overview](https://legacydocs.hubspot.com/docs/methods/email/transactional_email/single-send-overview)

Hope this helps!

If we were able to answer your query, kindly help the community by marking it as a solution.  
Thanks and Regards.