When you use certificate authentication you have to set the uploadReadAheadSize in the IIS metabase to your max email size, the default is 48KB so nearly any attachment cannot be sent/forwarded.
With the following command you can change the value (in this case 10MB):
C:\Windows\System32\inetsrv\appcmd.exe set config -section:system.webServer/serverRuntime /uploadReadAheadSize:"10485760" /commit:apphost
C:\Windows\System32\inetsrv\appcmd.exe set config “Default Web Site” -section:system.webServer/serverRuntime /uploadReadAheadSize:”10485760″ /commit:apphost
After this restart the IISAdmin service to affect the change.
ImageMagick® is a software suite to create, edit, compose, or convert bitmap images. It can read and write images in a variety of formats (over 100) including DPX, EXR, GIF, JPEG, JPEG-2000, PDF, PNG, Postscript, SVG, and TIFF. Use ImageMagick to resize, flip, mirror, rotate, distort, shear and transform images, adjust image colors, apply various special effects, or draw text, lines, polygons, ellipses and Bézier curves.
Make sure that the required dependencies are installed:
Always backup your MySQL database with mysqldump but if you didn’t you can restore it from file system.
If your backup include the /var/lib/mysql directory, if so then you should be able to restore the database. Each database is contained in a separate subdirectory off /var/lib/mysql, so look for one named with the name of your database (WordPress or any other). To restore it, shutdown the mysql server first
sudo /etc/init.d/mysql stop
Copy the backup-ed directory into the same location on your new server, then restart mysql server
sudo /etc/init.d/mysql start
Note:- that its much better to take actual database dumps using the mysqldump command than to rely on this method. so for the future, you should schedule something like this: