Send a mail to IFTTT trigger mail to post to a facebook page. You can include pictures as attachments for picture posts. Customise what and how you want to publish using IFTTT tags.
If
Send IFTTT any email
Send IFTTT any email at trigger@applet.ifttt.com and this Trigger fires. You can optionally add a single file attachment and IFTTT will create a public URL to the file as an Ingredient. This trigger will reject emails with attachments over 30MB.
Then
Upload a photo from URL
This Action will upload a new photo, from the given URL, to a Facebook Page album you specify.
Explore more great ways to automate Facebook Pages and Email