Glossary entry (derived from question below)
Spanish term or phrase:
protesto a usted la seguridad de mi atención
English translation:
please accept the assurances of my highest consideration
Spanish term
Spain
Just take my word for it!
Native in: Galician 
, Spanish
Works in: Spanish to English, English to Spanish, Portuguese to Spanish, and 6 more.
protesto a usted la seguridad de mi atención
Después del texto aparece una línea que dice:
Con este motivo, protesto a usted la seguridad de mi atención.
¿Alguien sabe cómo se traduce y qué quiere decir eso? Es la primera vez que lo veo.
¡Gracias anticipadas!
Sep 10, 2018 15:39: Juan Jacob changed "Level" from "Non-PRO" to "PRO"
PRO (3): Stuart and Aida Nelson, Robert Carter, Juan Jacob
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Proposed translations
Will do!
Native in: Portuguese (Variant: European/Portugal) 
Works in: English to Portuguese, French to Portuguese, German to Portuguese, and 1 more.
please accept the assurances of my highest consideration
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philgoddard
: I think this is the meaning but, if so, we would use a much less flowery wording in English.
1 hr
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I agree that it is flowery, but it is widely used in "official" correspondence, as you can see in the link I provided ;)
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Robert Carter
: I agree with Phil. I think you're right but a "Sincerely" or "With sincerest regards" would probably work better.
3 hrs
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Your suggestions would certainly work better in any language, but Gema wanted to know how to translate it, and I am simply using the equivalent expression... as much as I dislike it ;)
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Stuart and Aida Nelson
: I don't think that this is widely used in official correspondence. At least the asker and I for sure has never seen it before.
3 hrs
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OK... I have seen it in French, Portuguese (my mother tongue) Spanish, l etc. It is extremely flowery and old fashioned perhaps, but I merely suggested the English equivalent.//https://www.linguee.es/portugues-espanol/traduccion/protesto...
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Juan Jacob
: Sí, fórmula de cortesía.
4 hrs
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Gracias, Juan!
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United Kingdom
English lawyer and German national
Native in: English (Variant: British) , Spanish (Variants: Latin American, Standard-Spain)
Works in: German to English, Italian to English, French to English, and 13 more.
I hereby assure you that the foregoing information is true
'protesto a usted' means to assure/ ensure in this context. 'La seguridad de mi atención' no es usual pero asumo que el socilitante quiere decir: confirmo que le he prestado toda mi mejor atención a las declaraciones hechas, o sea que las declaraciones son correctas.
protestar ser cierto
https://forum.wordreference.com/threads/protestar-ser-cierta...
protesto lo necesario
https://www.proz.com/kudoz/spanish-to-english/law-general/50...
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Robert Carter
: No, this is over-translation IMO. I think the whole thing is an elaborate way of signing off, a "regards" if you like. Saludos!
2 hrs
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It could well be, but it is not usual to see 'protesto a usted' in equivalents to 'yours faithfully', etc.
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Juan Jacob
: Nunca había visto esa fórmula de cortesía, pero eso es: fórmula de cortesía.
2 hrs
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Lo que hay que ver es que si esto es una fórmula de cortesía y no, la respuesta no es una fórmula de cortesía. Podría ser una declaración muy común en solicitudes.
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United States
Six languages into flawless English
Native in: English
Works in: German to English, French to English, Spanish to English, and 4 more.
(Yours) sincerely/With best wishes
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Stuart and Aida Nelson
: This would only apply if you know the name of the addressee. I suspect, yours faithfully would be more appropriate for a document of this kind.
2 hrs
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There are lots of possibilities here - I've just given two.
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Discussion
I didn’t know / have never seen the Mexican “protesta universitaria” (the meaning over here is “university students protest”).
In the end, the phrase seems to be a mixture of “bajo protesto de decir verdad” + "Reitero a usted la seguridad de mi alta y distinguida consideración.".
Funny and interesting mixture.
It is also good to know that protesto is also used as 'I affirm', which is why I interpreted it as a declaration in my answer. Manuel, de acuerdo con lo de “cortar y pegar” :), you live and learn, cheers, saludos para todos, Aida
"Reitero a usted la seguridad de mi alta y distinguida consideración."
The odd word out to me here is "protesto", but even then you can find a few examples of this online. This one is from the DOF:
"PROTESTO A USTED LA SEGURIDAD DE MI DISTINGUIDA CONSIDERACIÓN."
https://dof.gob.mx/nota_detalle.php?codigo=5535170&fecha=17/...
"Protesto" is also commonly found in the "protesta universitaria" ceremonies for UNAM undergrads on passing their "exam de recepción", where it roughly translates as "I do" or "I do so affirm":
Cuando el resultado del examen haya sido “Aprobado”, el Presidente del jurado le pedirá al sustentante participe en la protesta universitaria, a la cual dará lectura. El sustentante contestará “si protesto” y el Presidente leerá el corolario de la misma.
https://www.zaragoza.unam.mx/portal/wp-content/Portal2015/Li...
¡Saludos a todos!
Atentamente.
Sírvase, etc.
Esas, sí.
De acuerdo con esto (http://www.differencebetween.net/language/difference-between... así como con la sugerencia de Stuart & Aída, “Yours faithfully” sería la traducción adecuada
De todas formas le he preguntado a la agencia que me lo envió, y el cliente ha dicho que cree que es una fórmula de cortesía equivalente a Yours faithfully, solo que mucho más rebuscada. ¡Gracias por tu preocupación!