Problem sending HTML emails in Outlook (classic) 2019

Question

Problem sending HTML emails in Outlook (classic) 2019

Nine Number 20

Hello, when I try to send an email in Outlook (classic) 2019, the HTML file in the email displays incorrectly and CSS styles are not applied. However, when I send an email in the web version of Outlook, all CSS styles are applied successfully. Could you please tell me what I can do to ensure the HTML file displays correctly in the desktop version of Outlook?

Jack-Bu 5,310 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-22T13:55:13.49+00:00

Hello Nine Number

It’s been a while since our last interaction.

I wanted check if you’ve had a chance to review the response provided by Jayden. We hope it addressed your questions thoroughly.

If you have any further questions or need additional clarification, please feel free to return and ask at any time.

Additionally, if you feel this discussion has been helpful, please consider marking this thread as accepted by clicking “Accept the answer.” This helps surface the information provided for others encountering similar issues and contributes to building a stronger, more informed community.

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Jack-Bu 5,310 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-22T13:55:13.49+00:00

Hello Nine Number

It’s been a while since our last interaction.

I wanted check if you’ve had a chance to review the response provided by Jayden. We hope it addressed your questions thoroughly.

If you have any further questions or need additional clarification, please feel free to return and ask at any time.

Additionally, if you feel this discussion has been helpful, please consider marking this thread as accepted by clicking “Accept the answer.” This helps surface the information provided for others encountering similar issues and contributes to building a stronger, more informed community.

Answer 1

Jayden-P 10,995 Внешний персонал Microsoft Модератор

Hi @Nine Number

Thank you for posting your question in the Microsoft Q&A forum.

Please note that this is the ru-ru forum. We kindly recommend posting your question in Russian so that more community members can assist you. Alternatively, you may also consider posting on the English forum if you prefer to use your native language. We sincerely appreciate your understanding.

Please check if you chose the correct format (HTML) in File > Option > Mail > Compose Messages. Пользовательское изображение

If you already got the correct format, your Outlook desktop might have some issue.

You can try:

Repair an Office application - Microsoft Support
Clear Outlook Cache: Press the Windows + R > Type %localappdata%\Microsoft\Outlook > Find the RoamCache folder > Delete all files in it.

Please try and let me know if it works for you, if not, we can figure out another approach.

Additionally, Outlook Web uses different render engine compared to Outlook 2019 (using Word).

So, sometimes it might break.

If the answer is helpful, please click "Accept Answer" and kindly upvote it. If you have extra questions about this answer, please click "Comment".

Note: Please follow the steps in our documentation to enable e-mail notifications if you want to receive the related email notification for this thread.

Nine Number 20 Баллы репутации

2025-10-08T14:42:14.0333333+00:00

I selected HTML in File > Option > Mail > Compose Messages and also cleared the cache at %localappdata%\Microsoft\Outlook\RoamCache, but that didn't help. Are there any other solutions for correctly displaying HTML emails?
Jayden-P 10,995 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-08T14:51:44.6133333+00:00

Hi @Nine Number

As I mentioned earlier, Outlook 2019 uses Word for rendering HTML emails.

So, it might not support some modern CSS. As an alternative, you could consider using Outlook Web which features browser engine to render HTML emails.

In Outlook 2019, you should inline CSS directly. Avoid using unsupported CSS (div, margin, button...)

I'm sorry that this might be inconvenient for you.
Jayden-P 10,995 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-08T14:57:40.1966667+00:00

Hi @Nine Number

You can also vote for this idea here Product limitation. · Community

Microsoft will listen and try their best to enhance customers' experience.

I hope this information helps.
Nine Number 20 Баллы репутации

2025-10-08T16:03:23.31+00:00

Hi
"In Outlook 2019, you should inline CSS directly"
Okay, please tell me how I can do this?
Jayden-P 10,995 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-08T16:42:33.3266667+00:00
Hi @Nine Number

Inlining CSS means applying all your styles directly inside the HTML tags using the style attribute, rather than putting styles in <style> blocks or external files.

For example, you shouldn't use <style> blocks

<style> p { color: blue; } </style>

Instead, put style inside it.

<p style="color: blue;">This is a paragraph.</p>
Jayden-P 10,995 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-09T12:30:14.04+00:00

Hi @Nine Number

Any update from you?

If my support helped you, please kindly mark this as accepted answer.

Warm thanks.
Jayden-P 10,995 Баллы репутации Внешний персонал Microsoft Модератор

2025-10-15T11:10:17.37+00:00

Hi @Nine Number

It's has been a while since our last interaction.

I just want to check if you still meet this issue.

If there is anything else I can help with, please feel free to reach out.

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Problem sending HTML emails in Outlook (classic) 2019

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