1.Every email service has its limited file size of the attachment file or the sum of all attached files and messages.

We made the survey that most of email service made the file size limit is 25MB, like Gmail, Yahoo, etc., Such email services as iCloud, Outlook made the file size not exceed 20MB. Still other email services, e.g. BlueMail, will not let you send emails up to 30MB.

All in all, the attachment file size is not 25MB mostly.
So if your photos are exceeding the limit a little, the most direct way you can follow to send the larger photos via email is zipping a folder with all the attached photos.

Select the large photos that you want to send via email > Right-click the files to select “Send to” > “Compressed (zipped) folder” from the drop-down menu.

Alternatively, you are able to put all the photos in one folder, and then right-click the folder name to select “Winzip” or other compression software > “Compress to “Bleep.7z” and email” to input your email address to send the large compressed photos.

Generally speaking, the standard zip format provided approximately 62% compression.

However, it always comes to be different.

I get a folder with all the photos in 29.4MB. After making the zip compression, I get a zip file with 25.5MB, which is only about 14% compression rate.

For the file slightly larger, the zip compression is OK. However, for the far large photo files, you need to move the next solution.

2.Generally speaking, good quality always comes with large file size in photos. However, still some photos compression software could help you to get the smaller photos with not-bad quality.

Apeaksoft Free Online Image Compressor is the totally free software to compress JPEG or PNG files from MB to KB with keeping the best quality.

For sending lots of photos via email, you had better compress them to reduce the file size.

Get over 25MB, 100MB or more images that want to send via Gmail?

Google Drive will work in the next part.

3.Google Drive is the file storage and synchronization service developed by Google. User can get the first 15 GB of storage to store data.

Google Drive works well with Gmail, so that you could send large photos by inserting the files using Drive easily.

Firstly, you should upload the massive large images that you want to send, to Google Drive.

You can learn more detailed steps by this article: https://www.apeaksoft.com/transfer/send-large-photo-by-email.html