Email Signature

An email signature is a block of text (and optionally HTML) automatically appended to messages you compose. Opterius Mail lets you create rich or plain text signatures and control when they are inserted.

Opening Signature Settings#

1. Click Settings (gear icon) in the top-right.
2. Select Signature from the settings menu.

Creating Your Signature#

The signature editor uses the same TipTap 2 rich-text editor as the compose window. You can:

• Type plain text and it will be formatted accordingly.
• Apply bold, italic, and underline formatting.
• Create bulleted or numbered lists.
• Insert hyperlinks (e.g. to your website or LinkedIn profile).
• Paste formatted content from another source.

Example Signature#

Jane Smith
Senior Developer | Acme Corp
jane@acmecorp.com | +1 (555) 123-4567
www.acmecorp.com

With HTML formatting, you can make your name bold and company name a hyperlink to your website.

Plain Text Mode#

Click the Plain text toggle at the top of the signature editor to switch to a plain text signature. Plain text signatures are used when sending plain text messages. When you compose in rich text mode, the HTML signature is used; when you compose in plain text mode, the plain text signature is used.

It is good practice to set both an HTML signature and a plain text fallback. If you only set an HTML signature, plain text messages will have no signature.

When the Signature Is Inserted#

Use the Append signature dropdown to control when your signature is automatically added:

The New messages only option is the recommended default. Most people do not want their full signature in every reply, especially in long email threads.

Inserting the Signature Manually#

If you have set automatic insertion to "Never" or you want to add your signature to a specific reply, click the Signature button in the compose toolbar (pen/signature icon). The signature is inserted at the current cursor position.

HTML Signature Tips#

Keep HTML signatures simple and compatible:

• Avoid <div> layout tables: Many email clients strip complex CSS. Use simple <p> or <br> tags.
• Use absolute image URLs, not embedded images: Embedded images in signatures increase message size. If you want a logo, host it on a public URL and reference it with <img src="https://...">.
• Keep images small: Signature images should be at most 200–300px wide. Scale them in HTML, not at full resolution.
• Test in multiple clients: Your HTML signature may render differently in Outlook, Gmail, and Apple Mail. Send yourself a test message and view it in those clients.
• Avoid JavaScript: Email clients block JavaScript entirely. It will never execute in a signature.

<!-- Good: simple, compatible signature -->
<p>
  <strong>Jane Smith</strong><br>
  Senior Developer | <a href="https://acmecorp.com">Acme Corp</a><br>
  <a href="mailto:jane@acmecorp.com">jane@acmecorp.com</a> | +1 (555) 123-4567
</p>

Per-Identity Signatures#

If multiple email identities (aliases) are configured on your account, you can set a different signature for each identity. When composing a new message, the signature corresponding to the selected From address is inserted automatically.

Manage per-identity signatures in Settings → Identities → [select identity] → Signature.

Previewing Your Signature#

Click the Preview button above the signature editor to see how your signature will appear in a composed message. The preview shows the signature rendered as it would be in an HTML email.

Removing Your Signature#

To remove your signature entirely:

1. Open Settings → Signature.
2. Clear all content from the editor.
3. Set Append signature to Never.
4. Click Save.

New and reply messages will no longer have a signature appended.