RC Policy on MS Office Comments ?

JAB Creations · September 30, 2025, 11:56:08 AM

On one mail system an image doesn't load because it's being removed with wildly obsolete Microsoft Office conditional comments:

Code Select

<!--[if mso]>
<a><img /></a>
<![endif]-->

However the image loads fine in RoundCube. The code basically says, in short, only load the business logo if they're using MS Office, otherwise, have a big empty header. Obviously, 12 table elements deep, whatever was used to create this monstrosity of an "HTML" email was very poorly "programmed".

But a lot of times when just the comments (but not the code within the conditional comments) is stripped it results in (even more) malformed XML.

What was the rational around simply removing the MS Office conditional comments but keeping the HTML code (and "HTML"-like code) within it?

JohnDoh · September 30, 2025, 02:53:57 PM

could you provide a sample message?

JAB Creations · September 30, 2025, 03:22:16 PM

Quote from: JohnDoh on September 30, 2025, 02:53:57 PMcould you provide a sample message?

Sure John, I stripped out the links and made the images relative to protect the business from being associated with this terrible "HTML":

Code Select

<body>

<div styl=
e=3D"display:none;"><img src=3D"track/open.php?u=3Dec724841842e67b5c2f3a9e59&id=3D3f5d18f060&e=3D256963ff96" height=3D"1" width=3D"1" style=3D"display:none;" alt=3D""></div>
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eBlockContainer" align=3D"center" id=3D"b1"><div><!--[if !mso]><!--></div=
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lock" target=3D"_blank" data-block-id=3D"1"><table align=3D"center" border=
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ight:auto" role=3D"presentation" data-testid=3D"image-1"><tbody><tr><td st=
yle=3D"border:0;border-radius:0;margin:0" valign=3D"top"><img alt=3D"logo"=
 src=3D"https://mcusercontent.com/ec724841842e67b5c2f3a9e59/images/4c164cb=
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display:block;max-width:100%;height:auto;border-radius:0" class=3D"mceLogo=
" /></td></tr></tbody></table></a><div><!--<![endif]--></div><div>
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tyle=3D"border:0;border-width:2px;vertical-align:top;margin:0"><img role=
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=3D"0" width=3D"100%" role=3D"presentation"><tbody><tr><td valign=3D"top"=
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tation" data-block-id=3D"16"><tbody><tr class=3D"mceRow"><td style=3D"back=
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 valign=3D"top"><table border=3D"0" cellpadding=3D"0" cellspacing=3D"24" w=
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 data-block-id=3D"15" colspan=3D"12" width=3D"100%"><table border=3D"0" ce=
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ody><tr><td style=3D"padding-top:0;padding-bottom:0;padding-right:0;paddin=
g-left:0" valign=3D"top" class=3D"mceGutterContainer" id=3D"gutterContaine=
rId-5"><table border=3D"0" cellpadding=3D"0" width=3D"10=
0%" style=3D"border-collapse:separate" role=3D"presentation"><tbody><tr><t=
d style=3D"padding-top:0;padding-bottom:0;padding-right:0;padding-left:0;b=
order:0;border-radius:0" valign=3D"top" id=3D"b5"><table width=3D"100%" st=
yle=3D"border:0;background-color:transparent;border-radius:0;border-collap=
se:separate"><tbody><tr><td style=3D"padding-left:24px;padding-right:24px;=
padding-top:12px;padding-bottom:12px" class=3D"mceTextBlockContainer"><div=
 data-block-id=3D"5" class=3D"mceText" id=3D"d5" style=3D"width:100%"><p><=
br /></p><p class=3D"mcePastedContent"><br /></p><p class=3D"mcePastedCont=
ent" style=3D"line-height: 1.5; margin-top: 12pt; margin-bottom: 12pt; mso=
-line-height-alt: 150%; direction: ltr;"><span style=3D"color:rgb(0=2C 0=
=2C 0);"><span style=3D"font-size: 11pt"><span style=3D"font-family: Arial=
=2C sans-serif"><span style=3D"background-color: transparent">Howdy=2C</span></span></span></span></p><p class=3D"mcePastedContent"=
 style=3D"line-height: 1.5; margin-top: 12pt; margin-bottom: 12pt; mso-lin=
e-height-alt: 150%; direction: ltr;"><span style=3D"color:rgb(0=2C 0=2C 0)=
;"><span style=3D"font-size: 11pt"><span style=3D"font-family: Arial=2C sa=
ns-serif"><span style=3D"background-color: transparent">I know you=E2=80=
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ide is the part that stresses them the most. To make your job easier=2C I=
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pan></p><p class=3D"mcePastedContent" style=3D"line-height: 1.5; margin-to=
p: 12pt; margin-bottom: 12pt; mso-line-height-alt: 150%; direction: ltr;">=
<span style=3D"color:rgb(0=2C 0=2C 0);"><span style=3D"font-size: 11pt"><s=
pan style=3D"font-family: Arial=2C sans-serif"><span style=3D"background-c=
olor: transparent">=F0=9F=91=89 </span></span></span></span><a href=3D"" target=3D"_blank"><span style=3D"=
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yle=3D"background-color: transparent">Download the Expense Tracker</span><=
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ction: ltr;"><span style=3D"color:rgb(0=2C 0=2C 0);"><span style=3D"font-s=
ize: 11pt"><span style=3D"font-family: Arial=2C sans-serif"><span style=3D=
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n-top: 12pt; margin-bottom: 12pt; mso-line-height-alt: 150%; direction: lt=
r;"><span style=3D"color:rgb(0=2C 0=2C 0);"><span style=3D"font-size: 11pt=
"><span style=3D"font-family: Arial=2C sans-serif"><span style=3D"backgrou=
nd-color: transparent">To make it even easier=2C here=E2=80=99s a quick bl=
urb you can copy/paste if you=E2=80=99d like to forward it:</span></span><=
/span></span></p><p class=3D"mcePastedContent" style=3D"line-height: 1.5;=
 margin-left: 30pt; margin-right: 30pt; margin-top: 12pt; margin-bottom: 1=
2pt; mso-line-height-alt: 150%; direction: ltr;"><em><span style=3D"color:=
rgb(0=2C 0=2C 0);"><span style=3D"font-size: 11pt"><span style=3D"font-fam=
ily: Arial=2C sans-serif"><span style=3D"background-color: transparent">=
=E2=80=9CHere=E2=80=99s a free expense tracker I came across. It=E2=80=99s=
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t you might find it useful!=E2=80=9D</span></span></span></span></em></p><=
p class=3D"mcePastedContent" style=3D"line-height: 1.5; margin-top: 12pt;=
 margin-bottom: 12pt; mso-line-height-alt: 150%; direction: ltr;"><span st=
yle=3D"color:rgb(0=2C 0=2C 0);"><span style=3D"font-size: 11pt"><span styl=
e=3D"font-family: Arial=2C sans-serif"><span style=3D"background-color: tr=
ansparent">Feel free to pass this along to anyone in your circle who could=
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0=2C 0=2C 0);"><span style=3D"font-size: 11pt"><span style=3D"font-family:=
 Arial=2C sans-serif"><span style=3D"background-color: transparent">Thanks=
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"line-height: 1.5; margin-top: 12pt; margin-bottom: 12pt; mso-line-height-=
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 style=3D"font-size: 11pt"><span style=3D"font-family: Arial=2C sans-serif=
"><span style=3D"background-color: transparent">With appreciation=2C<br />=
---<br />---</span></span></span></span>=
</p><p class=3D"mcePastedContent last-child"><br /></p></div></td></tr></t=
body></table></td></tr></tbody></table></td></tr></tbody></table></td></tr=
></tbody></table></td></tr></tbody></table></td></tr></tbody></table></td>=
</tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table><=
/td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></tab=
le></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody><=
/table></td></tr></tbody></table><!--[if (gte mso 9)|(IE)]></td></tr></ta=
ble><![endif]--></td></tr></tbody><tbody data-block-id=3D"13" class=3D"mc=
eWrapper"><tr><td style=3D"background-color:transparent" valign=3D"top" al=
ign=3D"center" class=3D"mceSectionFooter"><!--[if (gte mso 9)|(IE)]><tabl=
e align=3D"center" border=3D"0" cellpadding=3D"0" width=
=3D"660" style=3D"width:660px;"><tr><td><![endif]--><table border=3D"0" c=
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" role=3D"presentation"><tbody><tr><td style=3D"background-color:#ffffff"=
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=3D"0" cellpadding=3D"0" width=3D"100%" role=3D"presenta=
tion" data-block-id=3D"12"><tbody><tr class=3D"mceRow"><td style=3D"backgr=
ound-position:center;background-repeat:no-repeat;background-size:cover" va=
lign=3D"top"><table border=3D"0" cellpadding=3D"0" width=
=3D"100%" role=3D"presentation"><tbody><tr><td style=3D"padding-top:0;padd=
ing-bottom:0" valign=3D"top" class=3D"mceColumn" id=3D"mceColumnId--8" dat=
a-block-id=3D"-8" colspan=3D"12" width=3D"100%"><table border=3D"0" cellpa=
dding=3D"0" width=3D"100%" role=3D"presentation"><tbody>=
<tr><td style=3D"background-color:transparent;padding-top:12px;padding-bot=
tom:12px;padding-right:24px;padding-left:24px;border:0;border-radius:0" va=
lign=3D"top" class=3D"mceButtonBlockContainer" align=3D"center" id=3D"b18"=
><div><!--[if !mso]><!--></div><table align=3D"center" border=3D"0" cellp=
adding=3D"0" role=3D"presentation" data-block-id=3D"18"=
 class=3D"mceButtonContainer"><tbody><tr class=3D"mceStandardButton"><td s=
tyle=3D"background-color:#000000;border-radius:50px;text-align:center" val=
ign=3D"top" class=3D"mceButton"><a href=3D"" target=3D"_blank" class=3D"mc=
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=2C Helvetica=2C Arial=2C Verdana=2C sans-serif;font-size:16px;font-weight=
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n:center;direction:ltr;letter-spacing:0px" rel=3D"noreferrer">Free Expense=
 Tracker</a></td></tr></tbody></table><div><!--<![endif]--></div><table a=
lign=3D"center" border=3D"0" cellpadding=3D"0" role=3D"p=
resentation" data-block-id=3D"18" class=3D"mceButtonContainer"><tbody><tr>
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xmlns:w=3D"urn:schemas-microsoft-com:office:word"
href=3D""
style=3D"v-text-anchor:middle; width:217.41px; height:54px;"
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if;
font-size: 16;
font-style: normal;
font-weight: normal;
letter-spacing: 0px;
text-decoration: none;
text-align: center;
direction: ltr;"
>
Free Expense Tracker
</center>
</v:roundrect>
</td>
<![endif]-->
</tr></tbody></table></td></tr><tr><td style=3D"background-color:#f4f4f4;p=
adding-top:8px;padding-bottom:8px;padding-right:8px;padding-left:8px;borde=
r:0;border-radius:0" valign=3D"top" class=3D"mceLayoutContainer" id=3D"b11=
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ss=3D"mceRow"><td style=3D"background-color:#f4f4f4;background-position:ce=
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=3D"padding-top:0;padding-bottom:0" valign=3D"top" class=3D"mceColumn" id=
=3D"mceColumnId--3" data-block-id=3D"-3" colspan=3D"12" width=3D"100%"><ta=
ble border=3D"0" cellpadding=3D"0" width=3D"100%" role=
=3D"presentation"><tbody><tr><td style=3D"padding-top:0;padding-bottom:0;p=
adding-right:0;padding-left:0" valign=3D"top" class=3D"mceGutterContainer"=
 id=3D"gutterContainerId-9"><table border=3D"0" cellpadding=3D"0" cellspac=
ing=3D"0" width=3D"100%" style=3D"border-collapse:separate" role=3D"presen=
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er" id=3D"b9"><table width=3D"100%" style=3D"border:0;background-color:tra=
nsparent;border-radius:0;border-collapse:separate"><tbody><tr><td style=3D=
"padding-left:16px;padding-right:16px;padding-top:12px;padding-bottom:12px=
" class=3D"mceTextBlockContainer"><div data-block-id=3D"9" class=3D"mceTex=
t" id=3D"d9" style=3D"display:inline-block;width:100%"><p class=3D"last-ch=
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nter" border=3D"0" cellpadding=3D"0" width=3D"100%" role=
=3D"presentation" data-block-id=3D"-2"><tbody><tr class=3D"mceRow"><td sty=
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JAB Creations · September 30, 2025, 08:35:02 PM

I decided to count the instances and if an additional string matches I'll warn the user about an unreliable software used by others to compose messages. Future employees can throw weeks of their lives to figuring out a more reliable policy but I've got a reasonably C-grade solution that was only an hour or two of my time. The image won't load for this message but I now get an error message and I can go back and look at Roundcube if I really have to.

JohnDoh · October 01, 2025, 02:58:34 AM

I ran your example through the HTML sanitizer that Roundcube uses and it removed all the MSO specific sections (the HTML in them, not just the comments). In your original post you mentioned about the logo specifically and yes that is retained by the HTML sanitizer because the code says "show this in everything that is NOT outlook"

Code Select

<!--[if !mso]><!--></div><a....</a><div><!--<![endif]-->

In this article you can read now this syntax is designed "With a slight change in syntax and some additional comment closing symbols, you can use MSO conditional comments to target all clients besides Outlook"

RC Policy on MS Office Comments ?

JAB Creations

JohnDoh

JAB Creations

JAB Creations

JohnDoh