Knowledge Base

Troubleshooting problems with emails and email signatures on mobile devices


You experience various problems with signatures and email layout when you send emails from mobile devices. For example, when you use a mobile device to reply to / forward a message that includes images and formatting, the layout of this message falls apart.


When the user forwards or replies to a message, the mobile device's email client might modify the message thread, by changing the email's format and reply separators or removing some elements. This is usually done for security purposes or to reduce the size of an email. You may experience various signature-related issues, depending on the used mobile device and software. Use the links below to learn about the most common problems and recommended solutions.

Images disappear from emails when replying from iPhone or iPad

When you use an iPhone or iPad to respond to an email, images embedded in the email body disappear from the conversation. This is the default behavior in all recent versions of the iOS operating system.

Luckily, if you use software from the CodeTwo Exchange Rules family, you can bring these pictures back via a dedicated action: Restore images removed by iPhone and iPad. The action is available in CodeTwo Exchange Rules and CodeTwo Exchange Rules Pro.

Email formatting is changed when using Microsoft Outlook for Android

You experience the following issue: emails replied to or forwarded via Microsoft Outlook for Android fall apart if they contain embedded pictures. For example, if an email contains a signature with images (Fig. 1., left side), then after your reply the signature layout and formatting changes (Fig. 1., right side), images get resized, etc.

Fig. 1. A signature with images before (left) and after (right) using the Load Full Message option in MS Outlook on an Android device.

This problem occurs when you reply to / forward an email in Outlook for Android and select the Load Full Message option (Fig. 2.). When the email is loaded into the body of your new message, the email's format is changed, which breaks the structure of the signature with images. This behavior is not related to CodeTwo software.

Fig. 2. The Load Full Message option in Outlook for Android might change email formatting.

To solve this issue, do not load your messages when replying or forwarding in MS Outlook on your Android device.


This issue was reported in devices running Android 5.0 and later, but earlier versions might also be affected.

Signatures are added to all emails except those sent from mobile devices

If signatures are not added emails sent from mobile devices but are added to all other emails, this might be caused by the lack of the Plain Text layout of your signatures.

Most mobile devices (such as those based on Android, Windows Phone, or iOS) send emails in Plain Text. That is why you need to ensure that a Plain Text signature layout is defined for each signature rule in the CodeTwo software that you use.
Learn more about the signature formats and layouts available in the signature editor


If you already have an HTML signature created for your rule, you can use the Convert to Plain Text option (Fig. 3.) available in the signature editor of your CodeTwo software (learn more). Your signature will be automatically converted to plain text. You can save the changes and close the editor.

Fig. 3. The option to convert an HTML signature to Plain Text.

Once you have both HTML and Plain Text signature layouts defined for your rules, CodeTwo software adds an appropriate signature version to emails, depending on the device used to send them. In the case of mobile devices, plain text signatures are added. If you prefer to add HTML signatures (which look better as the HTML format offers more customization options), some CodeTwo products allow you to convert plain text emails to HTML. Read our Knowledge Base article to learn about the available options.

Messages from Apple devices and mobile devices are sent in plain text

If emails sent by Apple devices (iPhones, iPads, Macs, etc.) and mobile devices are sent in plain text and you prefer to convert them to HTML (so that HTML signatures are added), you can force email format conversion. See this article for more information.

Images in email signatures load very slowly on mobile Outlook versions

You can learn more about this problem in our Knowledge Base article.

Phone links in email signatures are not recognized by mobile devices

If your signatures contain click-to-call links with phone numbers, and these links do not work on mobile devices, check out this article.

Mobile signatures get mixed with signatures added by CodeTwo software

If mobile signatures (such as Sent from my mobile device) get mixed with signatures added by CodeTwo software, and you get double signatures, you might want to remove the ones from mobile devices. See this article for guidelines.

See also:

Common image-related problems in email signatures