app/views/mailer/mfa_notification.html.erb
<% @title = "Please enable multi-factor authentication (MFA)" %>
<% @sub_title = "Hi #{@user.handle}" %>
<!-- Body -->
<table width="100%" border="0" cellspacing="0" cellpadding="0" bgcolor="#ffffff">
<tr>
<td class="content-spacing" style="font-size:0pt; line-height:0pt; text-align:left" width="20"></td>
<td>
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="35" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="40" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
<div class="h3-1-center" style="color:#1e1e1e; font-family:Georgia, serif; min-width:auto !important; font-size:20px; line-height:26px; text-align:center">
We care about keeping your RubyGems.org account secure and recommend enabling multi-factor authentication for <b>both UI and API</b>.
Setting up multi-factor authentication (MFA) only takes a few minutes and goes a long way towards protecting your account and the Ruby ecosystem.
<br/>
Once enabled, we will ask you for an OTP for actions like <b>sign in</b> and <b>gem push</b>.
<br/>
Please click on the Enable Multi-factor Authentication (MFA) button below to register a new device. You may be asked to first log in to your account. You can also find the same link on your <%= link_to("Edit Profile", edit_profile_url(host: Gemcutter::HOST)) %> page.
</div>
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="30" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
<!-- Button -->
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center">
<table width="210" border="0" cellspacing="0" cellpadding="0">
<tr>
<td align="center" bgcolor="#e9573f">
<table border="0" cellspacing="0" cellpadding="0">
<tr>
<td class="img" style="font-size:0pt; line-height:0pt; text-align:left" width="15"><table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="50" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
</td>
<td bgcolor="#e9573f">
<div class="text-btn" style="color:#ffffff; font-family:Arial, sans-serif; min-width:auto !important; font-size:16px; line-height:20px; text-align:center">
<a href=<%= new_multifactor_auth_url %> target="_blank" rel="noopener" class="link-white" style="color:#ffffff; text-decoration:none"><span class="link-white" style="color:#ffffff; text-decoration:none">ENABLE MULTI-FACTOR AUTHENTICATION (MFA)</span></a>
</div>
</td>
<td class="img" style="font-size:0pt; line-height:0pt; text-align:left" width="15"></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
<!-- END Button -->
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="40" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
<div class="h3-1-center" style="color:#1e1e1e; font-family:Georgia, serif; min-width:auto !important; font-size:20px; line-height:26px; text-align:center">
Check our guides for more details on <%= link_to("setting up multi-factor authentication (MFA)", "https://guides.rubygems.org/setting-up-multifactor-authentication/") %> and <%= link_to("using multi-factor authentication (MFA) with command line", "https://guides.rubygems.org/using-mfa-in-command-line/") %>.
</div>
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="35" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
<table width="100%" border="0" cellspacing="0" cellpadding="0" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"><tr><td height="35" class="spacer" style="font-size:0pt; line-height:0pt; text-align:center; width:100%; min-width:100%"> </td></tr></table>
</td>
<td class="content-spacing" style="font-size:0pt; line-height:0pt; text-align:left" width="20"></td>
</tr>
</table>
<!-- END Body -->