email-to-mhtml.py

# Load email message
eml = MailMessage.load("Message.eml")

# Convert email to MHTML
eml.save("SaveAsMhtml.mhtml", SaveOptions.default_mhtml)

eml-to-html.py

import aspose.email as ae
from aspose.email import MailMessage, SaveOptions, HtmlFormatOptions

# Load EML message
eml = MailMessage.load("Message.eml")

# Set SaveOptions
options = SaveOptions.default_html
options.embed_resources = False
options.HtmlFormatOptions = HtmlFormatOptions.WriteHeader | HtmlFormatOptions.WriteCompleteEmailAddress #save the message headers to output HTML using the formatting options

# Convert EML to HTML
eml.save("SaveAsHTML.html", options)

msg-to-html.py

import aspose.email as ae
from aspose.email import MailMessage, SaveOptions, HtmlFormatOptions

# Load EML message
msg = MailMessage.load("Message.msg")

# Set SaveOptions
options = SaveOptions.default_html
options.embed_resources = False
options.HtmlFormatOptions = HtmlFormatOptions.WriteHeader | HtmlFormatOptions.WriteCompleteEmailAddress #save the message headers to output HTML using the formatting options

# Convert msg to HTML
msg.save("SaveAsHTML.html", options)