When posting photos via email, all you need to do is drag and drop the image you want to include into your email message. If you attach more than one image file, Posthaven will organize them into a gallery. However, if you include text between each attached image, then those images will be presented inline with your text. Here's what an email message looks like for posting inline photos.
Notice that the photo captions are on a line immediately below the photo but then there's a blank line between the caption and the next photo. Without those blank lines, Posthaven will collect each caption at the top of your post and then organize the images as a gallery. Below is what the posted results of this email looks like.
View of St. George Street through the St. Augustine City Gates.
The Arrivas House on St. George Street.