I mean from another email client? Is this possible at all?

If it's for your business, I think it's definetely better to hire a professional promoter for your website than asking random guys on forums
But anyway I can say from my own experience of working in marketing strategy that for the promotion of the websites the most important things are:
- focusing on website SEO (it consists from many tools, you need to find the best strategy for your site, for example using various keywords in its title, content and copywriting articles is a very important part of it)
- social media marketing (for example social media accounts in Twitter and Facebook are a very effective way for finding new customers, providing loyalty programs for them and advertising your site)
- search engine listing (it's based on submitting new content to the search engine directories like Yahoo!, Bing, Google etc. for its indexation https://neilpatel.com/blog/listings-that-engages-trust/)
- signature branding (your brand image represents your company/website so it should be recognazible, catching and unique in style and design, it can be used for widespreading in email account, forums etc.)

Also for the effective promotion your website should be already really well in case of content and design. It needs to be informative, user-friendly, interesting for your audience, have an interesting and original design with various good images and stock photos bundles https://masterbundles.com/downloads/category/active/stock-photography/, well-made in case of navigation and all other necessary functions.

Having a unique and catchy logo is really important for any business. Logos cover many necessary functions for it, like for example:
- revealing your identity (it shows your customers who you are, what services/products you provide and why it's better to choose you instead of any other company)
- attracting new customers/clients (it's mostly based on the logo's design because its color and design draw interest and increase curiosity of your potential customers)
- distinguishing your company from other competitors (it's especially important in case of one and the same sphere like pizza restaurants, your customers should see why you're so unique and worth trying)
- increasing brand loyalty (making changes for logo during your business development is ok but you need to find in the end the last and best type of it because it should become familiar and recognizable for your customers)

Also having only a good logo isn't enough for a successful marketing strategy, you need always to use many other advertising tools like online marketing, to prepare recognizable symbols made in monogram maker https://masterbundles.com/monogram-maker-8-amazing-options-to-create-monogram-logo-designs-with-monogram-maker-online/ in addition to your logo, organize various discount programs for your clients and so on.